Dan Kuso
Full name: Dan Kuso
Age: 16
Species: Human
Gender: Male
Main Attribute: Pyrus
Partner: Helix Dragonoid
Info:Dan is a boy who really loves Bakugan, but gets frustrated easily. His greatest ambition is to be the number one brawler in the world, which is what he attends at the last episode of Bakugan Battle Brawlers. He tends to act rash and impulsive which often leads him to trouble. He is very eager for a brawl, thinking he can take on anyone, which causes him to complain a lot when he has to wait around in hiding, as shown in the first and second season. By the third season Dan has outgrown that habit as he was telling Jake to help rebuild the second shield generator after they had a successful victory over the Gundalians.
Dan used to play using raw power without any kind of strategy, often caring more about winning and not the consequences to come. This attitude is what caused him and Drago to get into a fight which ended with Dan throwing Drago in the river. After losing a battle to Ryo and reuniting with Drago, Dan learned that there's more to Bakugan than just power. Because of this Dan was able to come up with a strategy to defeat Ryo in a rematch. After that experience, Dan started using a little more strategy in his battles. Through one of his strategies he was able to defeat Chan Lee, the third ranked Bakugan player.
Full name: Marucho Marukra
Age: 15
Species: Human
Gender: Male
Main Attribute: Aquos
Partner: Akwimos
Info: He is a wealthy, generous boy who specializes in Aquos. He is the brain of the Brawlers, a real walking encyclopedia. He loves to play Bakugan and work on strategies. He use to be extremely obedient to his parents out of fear, but that changed when he joined the Brawlers, however he is still very obedient. He now has no regrets for the past, realizing that he only wanted to make his parents happy. Marucho has a butler named Kato.
Info:Dan is a boy who really loves Bakugan, but gets frustrated easily. His greatest ambition is to be the number one brawler in the world, which is what he attends at the last episode of Bakugan Battle Brawlers. He tends to act rash and impulsive which often leads him to trouble. He is very eager for a brawl, thinking he can take on anyone, which causes him to complain a lot when he has to wait around in hiding, as shown in the first and second season. By the third season Dan has outgrown that habit as he was telling Jake to help rebuild the second shield generator after they had a successful victory over the Gundalians.
Dan used to play using raw power without any kind of strategy, often caring more about winning and not the consequences to come. This attitude is what caused him and Drago to get into a fight which ended with Dan throwing Drago in the river. After losing a battle to Ryo and reuniting with Drago, Dan learned that there's more to Bakugan than just power. Because of this Dan was able to come up with a strategy to defeat Ryo in a rematch. After that experience, Dan started using a little more strategy in his battles. Through one of his strategies he was able to defeat Chan Lee, the third ranked Bakugan player.
Marucho Marukra
Full name: Marucho Marukra
Age: 15
Species: Human
Gender: Male
Main Attribute: Aquos
Partner: Akwimos
Info: He is a wealthy, generous boy who specializes in Aquos. He is the brain of the Brawlers, a real walking encyclopedia. He loves to play Bakugan and work on strategies. He use to be extremely obedient to his parents out of fear, but that changed when he joined the Brawlers, however he is still very obedient. He now has no regrets for the past, realizing that he only wanted to make his parents happy. Marucho has a butler named Kato.
Shun Kazami
Full name: Shun Kazami
Age: 17
Species: Human
Gender: Male
Main Attribute: Ventus
Partner: Harktor
Info: Shun is one of the calmest brawlers in the series. He rarely gets flustered or annoyed, and even when he is annoyed, he maintain's a cool voice (although he voices his displeasure). Shun is a lone wolf and always focuses in battles. 
Fabia Sheen
Full name: Fabia Sheen
Age: 16
Species: Neathian
Gender: Female
Main Attribute: Haos
Partner: Aranaut
Info: She is the sister of Queen Serena, the Neathian Queen. Fabia's reason for brawling is to save her planet from the Gundalians.She seems to have some kind of Mira's initiative and love for freedom. She also seems to be strong, because she shoulder threw Dan twice in episode 3, the first was by accident and the second was when she got mad at Dan after losing and in episode 10 when Zenet tried to take her as a hostage and Fabia threw her hard on the ground. Those incidents may prove Ren Krawler's statement about the Neathians' specialty at close combat, although most of what Ren said was a lie to put down the Neathians. As a Neathian, she looks like her sister. As a human girl, she has blue hair and green eyes. She wears a white and orange robe with a yellow, orange and white robe with rings and white and blue boots. She also has pink earrings.
Jake Vallory
Full name: Jake Vallory
Age: 15
Species: Human
Gender: Male
Main Attribute: Subterra
Partner: Coredem
Info: Jake is big hearted and very brave, he is sometimes headstrong, often using brawn instead of brain, and sometimes is a little scared when shown the elements of Bakugan. He has a great admiration of Dan to which he gives him the nickname "Dan the man", occasionally implementing rhymes as well, something that displeases Dan.He first meets Dan when he moves to Bayview, goes to Dan's high school, and plays American Football.
Ren Krawler
Full name: Ren Krawler
Age: 16
Species: Gundalian
Gender: Male
Main Attribute: Darkus
Partner: Linehalt
Info: Ren is a Gundalian disguised as a human, he was sent by Emperor Barodius to find the strongest brawlers to help defeat Neathia and to find the DNA Code. Ren comes from the underground world of Gundalia, where he was kept by Emperor Barodius' family because he possesses a Dark Bakugan with a very powerful ability (the Forbidden Power). Due to his knowledge of the Gundalians, Ren will prove a valuable asset in defeating them. He lies to the brawlers telling them that the Neathians love war and invaded Gundalia and that the Gundalians always want peace, when it's actually the other way around. He probably gave the brawlers the newer Phantom Data in order to let the Gundalians pass into Bakugan Interspace detected as so-called "Neathians".He looks artful, cruel and he underestimates friendship at first, but after that, he showed the kindness as he always feel sorry when one member of his team was punished for their loses or like when he try to save Sid from falling into the valley and saved Marucho from being captured by a flesh-eating plant. 
Sid Arkale
Full name: Sid Arkale
Age: ?
Species: Gundalian
Gender: Male
Main Attribute: Pyrus
Partner: Rubanoid
Info: Sid Arkale is a Pyrus brawler from Gundalia. He was partnered with Pyrus Rubanoid and is part of Ren's team to infiltrate Bakugan Interspace.
Lena Isis
Full name: Lena Isis
Age: ?
Species: Gundalian
Gender: Female
Main Attribute: Aquos
Partner: Phosphos
Info:Lena Isis is an Aquos Brawler from Gundalia. She is partnered with Phosphos and was part of Ren's team to infiltrate Bakugan Interspace.
Jesse Glenn
Full name: Jesse Glenn
Age: ?
Species: Gundalian
Gender: Male
Main Attribute: Ventus
Partner: Plitheon
Info:Jesse Glenn is a Ventus brawler from Gundalia. He is partnered with Plitheon and was part of Ren's team to infiltrate Bakugan Interspace. 
Zenet Surrow
Full name: Zenet Surrow
Age:?
Species: Gundalian
Gender: Female
Main Attribute: Haos
Partner: Contestir
Info:Zenet Surrow is a Haos brawler from Gundalia. She is partnered with Contestir. She seems to have a strange personality.
Mason Brown
Full name: Mason Brown
Age: ?
Species: Gundalian
Gender: Male
Main Attribute: Subterra
Partner: Avior
Info:Mason Brown is a Subterra brawler from Gundalia, and also part of Ren's team to infiltrate Bakugan Interspace. He seems to be the most calm person of the team when it come to a battle, but when it comes to anything else he spazz a lot and blames Avior and calls his partner old timer or old dog in a lot of the episodes.
Emperor Barodius
Full name: Emperor Barodius
Age: ?
Species: Gundalian
Gender: Male
Main Attribute: Darkus
Partner: Dharak
Info: He was born into a family that had ruled over Gundalia for generations. He was the leader of the evil Twelve Orders which reigns over Gundalia and seeks to conquer Neathia. Barodius had been able to rule Gundalia because of his overwhelming strength and special ability to execute battles simultaneously. His father was the previous ruler of Gundalia; however, when Barodius took the throne he decided to change many of his father's policies, the most notable being seeking the Sacred Orb despite his father having feared its power. This act sparked the Neathian-Gundalian War. It has been stated that he disliked his father a great deal, such as when he called his father a "superstitious old fool," and laughs when he destroyed his father's portraits. He wanted the Sacred Orb so he could get the secret DNA code from all the Bakugan who possess it, his ultimate goal being to create the most powerful Bakugan in the entire universe with which he would rule all reality (the entire universe and possible multiverse). His longtime childhood friend and most trusted confidant was Gill, while a majority of the other Twelve Orders don't trust him or don't agree with what he is doing, but follow him out of fear. 
Gill
Full name: Gill
Age: ?
Species: Gundalian
Gender: Male
Main Attribute: Pyrus
Partner: Krakix
Info: Gill was a calm, cool warrior who pledges loyalty to Emperor Barodius. He has no parents and was brought up by Emperor Barodius, whom he looks up to like an older brother. If ordered by Emperor Barodius, he will go into battle like an obedient soldier regardless of right or wrong. Gill trained the Special Bakugan Team that was in charge of protecting Emperor Barodius. His student and prodigy was Airzel. Gill shows more patience with his subordinates, such as giving Lena advice concerning Kazarina and giving Zenet a second chance, although eventually his patience wears thin as well at their losses.
Stoica
Full name: Stoica
Age: ?
Species: Gundalian
Gender: Male
Main Attribute: Aquos
Partner: Lythirus
Info:He has a split personality, one of an angel, the other of the devil. When he's an angel he is fun to be around, but when he is in devil mode, he is frighteningly cruel and no one can stop him. Stoica has lots of trick moves during battle and opponents have a hard time reading him. He has saved Gundalia many times with ingenious battling abilities. He is the youngest member of the Twelve Orders. It is unknown why, but somehow he was able to breathe underwater as shown in episode 14, when he is easily beating Marucho.
Airzel
Full name: Airzel
Age: ?
Species: Gundalian
Gender: Male
Main Attribute: Ventus
Partner: Strikeflier
Info: Emperor Barodius and Gill recruited Airzel to be part of the Twelve Orders. He lurks in the shadows, to protect Barodius who chose him personally to be part of the Twelve Orders. Airzel is the leading expert in enemy surveillance and information analysis. Airzel is the #1 trainer on the Special Bakugan Team. Airzel is a tough brawler who shows great leadership on the battlefield.
Kazarina
Full name: Kazarina
Age: ?
Species: Gundalian
Gender: Female
Main Attribute: Haos
Partner: Lumagrowl
Info: She was sly, cold-hearted female battler who is always by Emperor Barodius' side, and had the desire to be his queen (as stated in Broken Spell). She had shown disdain for Gill since he is Barodius' right hand man instead of her, but he shows no trust in her as well. She worked as the Director of the Bakugan Biological Research Center but most people such as Gill and Stoica refered to her as a Witch or a Mad Scientist. There were rumors that say she was secretly undergoing cruel living-body experiments to heighten the Gundalian Bakugan's abilities (proven to be true). Her goal was to develop abilities to rival those of Neathia's. She was an exceptional scientist who had unraveled the mysteries of Bakugan evolution. She showed very little care for others and evaded much punishment by blaming and executing an inferior. She also had no problem with killing and torturing her enemies and people that she didn't like. She also had the power to hypnotize humans, Gundalians, and Bakugan.
Nurzak
Full name: Nurzak
Age: ?
Species: Gundalian
Gender: Male
Main Attribute: Subterra
Partner: Sabator
Info: Nurzak is a scholarly and wise intellectually. Although he's the oldest member of the Twelve Orders, he has the most physical energy. Emperor Barodius trusts Nurzak and he has many followers. He is the number one officer of the Twelve Orders and is very good at analyzing the opponent, planning strategy and evaluating the situation. He was serving the Gundalians since the reign of Barodius' father, and agrees with his father that the Sacred Orb is dangerous to anyone who tries to get it for evil purposes, leading to a distrust in Barodius' dark intentions. His Guardian Bakugan is Sabator. His Battle Gear is Chompixx. 
Queen Serena
Full name: Queen Serena
Age: ?
Species: Neathian
Gender: Female
Main Attribute: Does not brawl
Partner: Does not brawl
Info: In addition to being Fabia's older sister, she is the acting queen of Neathia. Not one to crumble under pressure, Serena goes and sends Fabia to Earth to get help against The Gundalians. In addition, she calls the ancient and legendary "antimatter energy" to cover her home world. But The Emperor of Gundalia uses his Bakugan, Dharak to break down the shield to steal and absorb the energy's power. Serena's biggest challenge is to keep Neathia running smooth and keep the people calm and safe while waiting for Fabia and The Brawlers to help destroy Barodius and his Twelve Orders. She is extremely beautiful and pretty as Dan and the others mentioned when they first met.In Dream Escape, she is wondering along with Elright why the Gundalians haven't attacked Neathia in some time.While, Elright takes that as a good sign, she is not so sure. Her suspisions are correct when Barodius himself attacks Neathia, Elright is confident that nothing they do can break though the 3rd Shield. But they are shocked to see that a new, more powerful Dharak, has broken through the shield easily. Afterwards her first thought was to get all of the citizens to emergency shelters below the castle and, after they were safely out of harms way all she could do is look on in horror as their home was being overrun and destroyed from invasion.In Gundalian Showdown, she tries her best to calm her people's fears by telling them that the Castle Knights would protect them. But, secretly she reveals that it is not the Sacred Orb that protects them but, the other way around.In Code Eve, she is confronted by Emperor Barodius himself, right after breaking in and attacking all of the Castle's defenses, he demanded she hand over the Sacred Orb.
But, she refused, calling him crazy to think she'd ever do something like that, he counters by saying it wasn't a request but an order. Still refusing to listen, she stands up from her throne and makes it clear to Barodius that if he wanted the Sacred Orb. then, he'd have to go thought her first, which he was more then willing to do. But, before he could strike her, Dan came rushing into the room and almost tackled him when the Sacred Orb warped them both away right in front of her eyes.In Destiny Revealed, she later appears along side Nurzak, the Brawlers and some Castle guard's to bear wittness to the event after Dan and Barodius's final battle for possession over the Sacred Orb, which ended in his defeat. But, unwilling to accept defeat, both Barodius and Phantom Dharak make one final attempt to gain the power of the Sacred Orb, by jumping in after it, but unable to handle the power ,Dharak along with Barodius are both destroyed/absorbed into the Orb.
Afterwards, she thanks Dan and the Brawlers for everything they've done, for her and her people, and agrees with Nurzak about making peace between their kind. Believing that this war has taught them all about the importance of peace and sees everyone off.
Captain Elright
Full name: Captain Elright
Age: ?
Species: Neathian
Gender: Male
Main Attribute: Haos
Partner: Raptorix
Info: In The Secret Package, he was leading troops to hold back the Gundalian forces, but when the first shield was destroyed he sent Linus to Earth to find Princess Fabia. Elright was then captured and interrogated by the Gundalians to reveal his location.In The Sacred Orb, he is able to escape from the Gundalians and returned to Neathia to battle alongside the Battle Brawlers. Also, his Guardian Bakugan is revealed to be a Haos Raptorix, meaning that he is a Haos brawler. In the end, he appoints the Battle Brawlers, as well as Fabia, to the Castle Knights.He reappears in Decoy Unit, showing the Brawlers who the Twelve Orders are and the current situation for Neathia without the second shield. He and Marucho devise a decoy plan to distract Airzel, Kazarina, and Stoica, who are closing in, while Dan, Shun, and Fabia sneak behind and reactivate the second shield. He is shown battling alongside the other Castle Knights while Marucho and Jake battle Airzel and Mason.Elright seems to be very brave. He also makes the fact that the Neathians are good at hand-to-hand combat closer to true.He appears to have been promoted from Captain to Commander in episode 35 because Queen Serena and other Castle Knights were calling him Commander Elright He appears in Gundalian Showdown, battling alonside Linus Claude and the other Castle Knights against Lena, Jesse, Zenet, and the other Gundalian Bakugan.
Linus Claude
Full name: Linus Claude
Age: ?
Species: Neathian
Gender: Male
Main Attribute: Pyrus
Partner: Neo Ziperator
In episode 11, Linus is sent by the Neathian captain to give Neo to Princess Fabia, because Neo holds The Element. But once Ren and Jesse brawl Linus and Shun, Neo is taken to Gundalia. Linus then goes into a hospital, with all of the brawlers surrounding him, trying to wake him up. Once they do, he tells them that Neo held The Element, but is now with Gundalia, and says that Neathia is in terrible danger now. On top of the fact that Strikeflier and Airzel already got to Neathia. This worries Fabia and The Neathian Bakugan, and confesses what happened to the Battle Brawlers.He appeared in episode 12, saying that he wants to save Neo. After the battle between Sid and Dan, Neo appeared in his dream and said that he had given the Element to a much stronger bakugan (Drago) and said farewell to Linus. Linus then cry out because he lost his friend.In episode 13, he is with the Brawlers in the Secret Meeting Room inside Marucho's house.In episode 14, he returns to Neathia with the other Brawlers, becoming one of the Castle Knights.In episode 22, he is told to upload Raytheus's data to Dan to battle against Impalaton.In episode 29, he made a brief appearance giving the brawlers food his mother used to make.In episode 36 he was shown to have been given Rubanoid by Ren before he left for Gundalia because he thought Rubanoid would be better with a Pyrus battler like Linus.Info from http://bakugan.wikia.com/wiki/Bakugan_Wiki
