Season 1[]
Battle Brawlers[]
- Dan Kuso (Danma Kuso): The main protagonist of the series, Dan is a boy who loves playing Bakugan and gets frustrated easily. His greatest ambition is to be the number one battle brawler in the world.
- Guardian Bakugan: Dragonoid (Drago) → Delta Dragonoid (Meteor Dragonoid) → Ultimate Dragonoid (Ultima Dragonoid) → Infinity Dragonoid → Neo Dragonoid → Cross Dragonoid → Helix Dragonoid → Lumino Dragonoid (Blaze Dragonoid) → Blitz Dragonoid → Titanium Dragonoid (Gren Dragonoid) → Fusion Dragonoid. Reptak.
- Bakugan Trap: Scorpion (Scorpio)
- Runo Misaki : Runo is a tomboy who loves playing Bakugan with people that have skills to show off. She also helps her parents run their family restaurant.
- Guardian Bakugan: Tigrerra (Tigress) → Blade Tigrerra (Blade Tigress). Aerogan.
- Marucho Marukura : An extremely rich boy who is very generous and intelligent, a bit like a walking encyclopedia. He loves to play Bakugan and he also likes to work on strategies. He used to be very obedient to his parents just because he wanted to please them, but that changed when he met the Brawlers. He now has no regrets for the past, realizing that he only wanted to make his parents happy.
- Guardian Bakugan: Preyas (Predator) → Angelo/Diablo Preyas (Predator Angel/Diablo). Elfin → Minx Elfin. Akwimos (Hopper). Infinity Trister. Radizen (Luger). Roxtor (Rockstar).
- Bakugan Trap: Tripod Epsilon (Tripod Theta)
- Julie Makimoto (Julie Hayward): Julie is a girl who tries to stay happy even when the worst has happened; her acting happy after something bad happened is generally just to hide up her true feelings. Julie forgets things easily, proving that she is a little scatterbrained at times.
- Guardian Bakugan: Gorem (Golem) → Hammer Gorem (Hammer Golem)
- Shun Kazami : Shun is the former first-ranked Bakugan Brawler who later moves down to sixth position, and then up to third position. He is a master of Bakugan, and is also Dan's childhood friend. Shun is a loner, a boy of very few words, yet is willing to help his friends at every turn almost.
- Guardian Bakugan: Skyress (Phoenix) → Storm Skyress (Storm Phoenix). Ingram → Master Ingram. Hawktor. Taylean (Faser). Jaakor (Pahn Shade). Skytruss (Hop Fokker). Orbeum (War Orbe).
- Bakugan Trap: Slash (Deceased)
- Alice Gehabich : A girl from Moscow who knows almost everything about Bakugan; usually, she just gives advice to the brawlers rather than brawl herself. She is also the granddaughter of Michael Gehabich.
- Guardian Bakugan: Alpha Hydranoid (Alphard Hydra)
Doom Beings[]
- Naga (Deceased): The primary antagonist of the season. A rogue Bakugan who wanted to control all power in Vestroia by stealing the completed Perfect Core.
- Hal-G (Deceased): He assisted Naga in his quest to get the Infinity Core from Wavern.
- Masquerade (Deceased): The top-ranked Bakugan player whose goal is to send all Bakugan to the Doom Dimension with his Doom Card, so he can evolve his Hydranoid and have the ultimate Bakugan.
- Guardian Bakugan: Reaper (Lucifer) (Deceased). Hydranoid (Hydra) → Dual Hydranoid (Dual Hydra) → Alpha Hydranoid (Alphard Hydra)
Brawlers Allies[]
- Joe Brown (Osamu Jo): A boy who runs the Bakugan Web Chat, and was initially mistaken for working for Masquerade.
- Guardian Bakugan: Wavern (Wyvern) (Deceased)
- Chan Lee: A girl who formerly held 3rd place in the world rankings.
- Guardian Bakugan: Fourtress (Ashura)
- Klaus von Hertzon: A man who formerly held 2nd place in the world rankings.
- Guardian Bakugan: Sirenoid (Siren)
- Komba O'Charlie: A boy who formerly held 5th place in the world rankings.
- Guardian Bakugan: Harpus (Harpy)
- Billy Gilbert:
- Guardian Bakugan: Cycloid (Cyclops)
- Julio Santana:
- Guardian Bakugan: Tentaclear (Flashal)
Other Brawlers[]
Shuji, Akira, Rikimaru, Ryo, Tatsuya, Kenji, Kenta, Jenny (Kani), Jewls (Mae), Takashi, Kosuke, Nene, Christopher (Tsuyoshi), Travis (Koichi)
Non-Brawlers[]
Miyoko Kuso, Shinjiro Kuso, Saki Misaki, Tatsuo Misaki, Shouko Marukura, Kyosuke Marukura, Shiori Kazami (Deceased), Grandpa Kazami, Daisy Makimoto (Daisy Hayward), Michael Gehabich
Season 2[]
Battle Brawlers Resistance[]
- Mira Firmin: The daughter of Clay Fermin, younger sister of the missing Keith Fermin-Clay, and the leader of the Resistance. She is accepted by the Brawlers, but not entirely trusted. She has feelings for Dan Kuso.
- Guardian Bakugan: Thunder Wilda (Wilda) -> Magma Wilda
- Bakugan Trap: Baliton
- Baron Leltoy (Baron Rich): A Vestal boy and a big fan of Dan, Marucho, Shun and Drago. He is kind and loyal to the Brawlers.
- Guardian Bakugan: Mega Nemus (Shaman) -> Saint Nemus (Saint Shaman)
- Bakugan Trap: Piercian (Guardian)
- Ace Grit: Handsome but sarcastic, he favors the Darkus attribute and is usually deep in thought, but isn't as good at talking and sometimes ends up regretting his words.
- Guardian Bakugan: Percival -> Knight Percival
- Bakugan Trap: Falcon Fly -> Flash Falcon Fly (Lavy Fly)
- Spectra Phantom: Spectra is part of the evil Vexos organization and the leader in the first arc. He is mysterious and wears a mask, battling with the Pyrus attribute. Despite Hydron's instructions to bring him Drago, Spectra seems to have plans of his own for Drago, and is obsessed with making the ultimate Bakugan. He is suspicious and it seems as if he is going to betray Prince Hydron shown in Return of a Friend. In Unmasked, Mira's suspicions of Spectra prove to be true when he removes his mask and is, in fact, Mira's brother, Keith. In Brotherly Love, Viper Helios gets upgraded to Cyborg Helios. In Final Countdown, the Vexos ditched him and set the palace on self destruct mode. He managed to escape with the help of Gus Grav. In Spectra Rises, Cyborg Helios was upgraded to Helios MK2. He now is working to take the Perfect Core energy from Drago and take over all of Vestal. Spectra temporarily joined with the Brawlers after Gus' disappearance. After losing one more battle against Dan, he joins the Bakugan Battle Brawlers as Keith Clay and only disguises when he's in battle.
- Guardian Bakugan: Viper Helios (Helios) -> Cyborg Helios -> Helios MK2 -> Infinity Helios
- Bakugan Trap: Metal Fencer
- Battle Gear: Twin Destructor. Zukanator.
- Gus Grav: A macho Subterra Brawler who is powerful in battle. He is very loyal to Spectra and Spectra only and is willing to do anything for him as shown by his urging not to remove his mask as part of his deal with Mira Clay, and is helping him take the Perfect Core energy. In Spectra Rises, he upgraded Vulcan to Rex Vulcan. After learning of the Vexos' plan to betray Spectra, Gus rescued Brontes and Elico (who were thrown out by Mylene Farrow) and saves him and Helios before the Vexos Motherpalace explodes. After feeling that his master was insulted by Zenoheld, Gus let his loyalty get to him as he challenged Zenoheld to a battle to defend Spectra's honor. Elico and Hexados sacrifice themselves to protect Gus and Vulcan, while the two stand and face Zenoheld's final attack together. He is presumed dead but is later revealed to have survived his battle with Zenoheld and has been imprisoned since.
- Guardian Bakugan: Premo Vulcan (Vulcan) -> Rex Vulcan
- Bakugan Trap: Hexados (Chronos) (Deceased)
Vexos[]
- Zenoheld (Deceased): The King of the Vestals and Prince Hydron's father; he aims to rule the Bakugan. As the Resistance continues foiling his plans, his revenge becomes ever more extreme. In the second arc of New Vestroia, after the Vexos had been driven out of Vestal, Zenoheld becomes the group's Pyrus brawler and a ruthless one at that.
- Guardian Bakugan: Farbros (Deceased)
- Volt Luster (Deceased): Preferring to battle with his strength rather than his mind, Volt uses Haos Bakugan. However, he is much more compassionate than this compatriots and plays fair, much unlike the rest of the group.
- Guardian Bakugan: Mega Brontes (Brontes) -> Alto Brontes (Joker Brontes). Boriates (Goliath) (Deceased)
- Bakugan Trap: Dynamo (Drone Spider) (Deceased). Hexstar (Carlvelt) (Deceased)
- Mylene Farrow (Mylene Pharaoh) (Deceased): Strong and loyal to the Vexos, she doesn't trust Spectra, sees Hydron as a spoiled brat, and has her own agenda. She is obsessed with power and views Bakugan with emotions as weak.
- Guardian Bakugan: Elico (Vega) -> Blast Elico (Blast Vega) (Deceased). Macubass (Deceased)
- Bakugan Trap: Tripod Theta (Tripod Epsilon)
- Hydron (Deceased): The leader of the Vexos who possesses the statues of the petrified Brawling Bakugan: Runo's Tigrerra, Julie's Gorem, Marucho's Preyas, Shun's Skyress, and Alice's Hydranoid, and he is currently setting off to complete his collection by getting his hands on Dan's Drago. After being disowned by Zenoheld between the first and second arcs, Hydron has become the Vexos' Subterra brawler to redeem himself in the eyes of his father.
- Guardian Bakugan: Dryoid (Dryad) (Deceased)
- Lync Volan (Deceased): He uses Ventus Bakugan and thinks he's unbeatable. He barely even tries to hide how self-serving he is, and gloats about how he only works for himself.
- Shadow Prove (Deceased): Shadow is cruel and merciless in battle and fights with the Darkus attribute. He often follows Mylene around. Shadow was a part of the evil Vexos organization.
- Guardian Bakugan: Hades (Deceased). MAC Spider (Deceased)
- Bakugan Trap: Fortress (Deceased)
- Clay Fermin (Deceased): Mira Fermin and Keith Fermin's father. He works in a lab in Alpha City, creating and testing on Bakugan. He no longer cared about his children's welfare, instead caught up with making the strongest and perfect Bakugan.