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The {{Nihongo|'''Battle Brawlers'''|バトルブローラーズ|Batoru Burōrāzu}} are the main heroes in the anime series. They were the ones who created the rules for [[Bakugan]] on [[Earth]]. They were also the team that went up against [[Masquerade]]'s minions and that put them up against some of the [[The Top Brawlers|top brawlers in the world]]. Later, they became the only humans other than [[Masquerade]] to go to the [[Doom Dimension]] where they fought the [[Six Legendary Soldiers of Vestroia]]. In each of their respective brawls their Bakugan evolved meaning each of them has an evolved [[Guardian Partner Bakugan]]. After [[Naga]] sent his forces to Earth, the Brawlers all took down one Hybrid Bakugan each, with help from other brawlers. They eventually earned high spots in the online rankings, making them very famous, especially after defeating the [[Doom Beings]] and returning peace to [[Earth]] and [[Vestroia]].

The Brawlers ([[Dan]], [[Shun]] and [[Marucho]]) return to [[New Vestroia]] and discover that it has been colonized by an alien race called [[Vestals]], who are unaware that the [[Bakugan]] are intelligent beings. Three Vestals: [[Mira Fermin]], [[Ace Grit]] and [[Baron Leltoy]], however, know the truth and form the [[Resistance|Bakugan Brawlers Resistance]]. While battling against the evil [[Vexos]], the Brawlers destroy each of the three [[Dimension Controller]]s that keep the [[Bakugan]] in their ball form, liberating New Vestroia. The Resistance part but reunite six months later when they discover that King [[Zenoheld]] of [[Vestal]] has attacked the [[Six Legendary Soldiers of Vestroia|Six Ancient Warriors]] in an attempt to steal the [[Attribute Energies]]. In desperation, the Ancient Warriors give the Resistance Bakugan their [[attributeAttribute]] energies to protect them from Zenoheld who has had a machine built to wipe out all Bakugan, the [[Bakugan Termination System]], but needs the energies to power it. After losing half the energies, the Brawlers decided to attack instead, engaging a temporary alliance with [[Spectra Phantom]], the former leader of the Vexos, along with his sidekick [[Gus Grav]]. However, the remaining energies are taken and the Brawlers rush to New Vestroia to evacuate all the Bakugan. [[Cross Dragonoid|Drago]], however, refuses to give up and manages to destroy the [[BT System]] and evolves again into [[Helix Dragonoid]]. Things quiet down until Spectra resurfaces again to battle Dan and when he loses, he concedes that Dan is number one and joins the Brawlers, returning to his original personality, [[Keith Fermin]]. He reveals that Zenoheld is working on a powerful weapon called the [[Alternative|Alternative System]] and helps construct [[JetKor]], a [[Battle Gear]] for Drago. Meanwhile, the Vexos begins crumbling from within as both [[Volt Luster]] and [[Lync Volan|Lync Volan]] decide to leave, feeling that Zenoheld and his son [[Prince Hydron]] have finally gone too far but are quickly disposed of by his son. In the final battle, the Brawlers with Gus, who joins as their newest member, manage to destroy the Alternative and the Resistance go their separate ways.

After defeating [[Zenoheld]], the Brawlers return to [[Earth]] and with the help of newcomer Ren Krawler, they set up [[Bakugan Interspace]]. However, [[Ren Krawler|Ren]] is not all that he seems to be and reveals that he is an alien in need of help, saying that his planet [[Gundalia]], is under attack by [[Neathia]], his planet enemy. Shun is not convinced and discovers, that Ren is lying once the Princess of Neathia, [[Fabia Sheen]] showed and proved Ren's story wrong. The Brawlers agree to help Fabia and head to [[Neathia]] to help fight off the Gundalians. Meanwhile, Ren begins showing signs of distrust for [[Barodius]] (Gundalia's Tyrannical Emperor) and eventually defects to rejoin the Brawlers. Unfortunately, [[Jake Vallory|Jake Vallory]], a new friend of Dan, is captured by [[Kazarina]] (Gundalia's leading Bakugan biologist) and brainwashed, so the Brawlers head to [[Gundalia]] to rescue him along with Ren's imprisoned teammates(who were imprisoned for faliure), joined by [[Nurzak]] (a former advisor to Barodius, who turned against him when he saw he would lead Gundalia to ruin) and [[Mason Brown]] (a teammate who had escaped imprisonment, who have also sided with Neathia). Once they do, the [[Twelve Orders]] mount a final attack on Neathia. The Brawlers rush back in time to defend the planet while [[Dan]] and Barodius engage in their final battle. Ren and Mason's teammates [[Jesse Glenn]], [[Lena Isis]] and [[Zenet Surrow]] are freed from their brainwashed state after Kazarina's demise. [[Linehalt]] uses his [[Forbidden Power]]s to restore the war torn Neathia, while Barodius and [[Dharak]] are destroyed by an overload of power from the [[Sacred Orb]] (which they tried to take anyway, despite Dan and Drago defeating them), which grants [[Drago (Dan Kuso)|Drago]] new powers and evolves him into [[Titanium Dragonoid]] and granting him the status of ruler over all Bakugan.

The Brawlers' reign as number one in [[Bakugan Interspace]] is threatened by two new powerful teams: [[Team Anubias]] and [[Team Sellon]]. To make matters worse, [[Dan]] and [[Drago (Dan Kuso)|Drago]] continuously suffer from visions sent to them by [[Mag Mel]] and [[Razenoid]]. These cause them to lose fans rapidly when Drago loses control in battle several times, threatening the lives of all the children in Interspace. [[Shun]] and [[Marucho]] find themselves unable to help as Dan is keeping everything to himself. When Dan loses control once again and nearly kills [[Anubias]] in battle, all of Dan's fans abandon him and he leaves for [[New Vestroia]] to train.

After a long time since Mag Mel was defeated, Marucho and the Vestal scientists create a new home for brawling known as [[Bakugan City]] to replace the now defunct Interspace. As Mira arrived back to Earth, her Vestal technology aid the Battle Brawlers at the Bakugan Battle Brawlers' headquarters. Also, Marucho and Shun have new Guardian Partner Bakugan, Radizen and Jaakor respectively, and [[Gunz Lazar]] and his partner Reptak join the Battle Brawlers as Dan's rival. Julie became a reporter and assisted the Brawlers by maintaining the trust between humans and Bakugan.

 *[[Dan Kuso|Daniel "Dan" Kuso]] - The leader. He uses [[Pyrus (Legacy)#Generation 1|Pyrus]] Bakugan and his [[Guardian Partner Bakugan]] is [[Drago (Dan Kuso)|Drago]].*[[Runo Misaki]] - A girl whose parents own their own cafe. She uses [[Haos (#Legacy)|Haos]] and her Guardian Partner Bakugan are [[Blade Tigrerra]] and temporarily [[Aerogan]].*[[Shun Kazami]] - A ninja whose mother fell into a coma. He uses [[Ventus (#Legacy)|Ventus]] and his Guardian Partner Bakugan are [[Storm Skyress]], [[Master Ingram]], [[Hawktor]], [[Taylean]], [[Jaakor]], [[Skytruss]] and [[Orbeum]]. Shun takes on the position of leader when Dan and Drago disappear in [[Mechtanium Surge]].*[[Alice Gehabich]] - The granddaughter of a [[Michael Gehabich|famous scientist]] and used to be her alter-ego [[Masquerade]]. She uses [[Darkus (#Legacy)|Darkus]] and her Guardian Partner Bakugan is [[Alpha Hydranoid]] that Masquerade gave to her.*[[Julie Makimoto]] - Dan's "Number One Fan". She uses [[Subterra]] and her Guardian Partner Bakugan is [[Hammer Gorem]].*[[Marucho Marukura|Choji "Marucho" Marukura]] - A rich kid who uses [[Aquos (#Legacy)|Aquos]] Bakugan and his Guardian Partner Bakugan are [[Preyas (Marucho Marukura)|Preyas]], [[Preyas Angelo/Diablo]], [[Minx Elfin]], [[Akwimos]], [[Trister]], [[Radizen]] and [[Roxtor]] that is borrowed from [[Mira Fermin]].

*[[Jake Vallory]] - Dan's new friend who's one of the newest members of the Brawlers. His Guardian Partner Bakugan was [[Subterra]] [[Coredem]].*[[Gunz Lazar]]- A new Haos brawler who always challenges [[Dan]] to a battle. His Guardian Partner Bakugan is [[Haos (#Legacy)|Haos]] [[Reptak]].

*[[Mira Fermin]] - The leader of the Bakugan Resistance and Keith's sister. She uses [[Subterra]] Bakugan and her Guardians Partners are [[Magma Wilda]] and [[Roxtor]] that she lent to [[Marucho Marukura]].*[[Spectra Phantom|Keith Fermin/Spectra Phantom]] - A former member of the [[Vexos]] and Mira's older brother. He uses [[Pyrus (Legacy)#Generation 1|Pyrus]] Bakugan and his guardian partner is [[Helios MK2]] and assumes his Spectra identity when battling. He returns in Mechtanium Surge as the new Darkus Brawler and is partnered with Darkus [[Infinity Helios]].

*[[Ren Krawler]] - A Gundalian spy who worked for the Twelve Orders. He was a member until Fabia and Shun exposed his true intentions, but he returns to the Brawlers after realizing that they are his true friends. His Guardian Partner Bakugan is Darkus [[Linehalt]].