Battle Brawlers

* Daniel (Dan) Kuso (voiced by Yu Kobayashi and Scott McCord): 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. Dan is a Pyrus battler, and his Guardian Bakugan is a Pyrus-attribute Dragonoid (nicknamed Drago)(voiced by Keiji Fujiwara). His Drago loves Wavern, who holds the Infinity Core within her. Dan and Runo often argue with each other; Dan is in love with Runo but doesn't confess until the end of the series, when they are seen on a date together.

* Runo Misaki (voiced by Eri Sendai and Julie Lemieux): Runo is a tomboy who loves playing Bakugan with people that have skills to show off. Runo is a Haos battler. Her Guardian Bakugan is a Haos-attribute Tigrerra (voiced by Atsushi One), who is very obedient to her and powerful in battle. Runo hates when people think that they can beat her just because she is a girl. She helps her parents run their family business. When Alice comes to visit, she helps Runo's family with their restaurant, which leads to Runo becoming jealous as boys came just to see her, despite being best friends and having an unbreakable sisterly bond. She is one of Dan's best friends, and has a crush on him. At the end of the series she and Dan are seen on a movie date.

* Chouji "Marucho" Marukura (voiced by Souichiro Hoshi and Joanne Vannicola): He is 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. He is an Aquos battler. Marucho is an Aquos battler, and his Guardian Bakugan is an Aquos-attribute Preyas and a Haos Angelo/Pyrus Diablo Preyas(showing up later in the series). Preyas was sent to the Doom Dimension in Marucho's battle with Klaus Von Hertzon. Later Klaus shows up with Preyas. Dan and Runo find a way to get Preyas back through defeating him in battle. Preyas evolves into a two-sided Bakugan called Preyas Angelo (Haos) and Preyas Diablo (Pyrus). Unlike the other Bakugan however, Preyas multiplies when he evolves, so Marucho got to keep the old Preyas. Preyas also has a move called "Change of Attribute" with that he can take advantage of the opponent's gate card.

* Julie Makimoto (voiced by Risa Mizuno and Katie Griffin): Julie is a girl who tries to stay happy even when the worst has happened (for example, when Billy ended up under the control of Masquerade); 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. Julie is a Subterra battler, whose Guardian Bakugan is a Subterra-attribute Gorem. At the beginning of the series, she is shown to have a little crush on Dan (which led to some arguments with a jealous Runo), but later, accepts that Dan and Runo are going out. At the end, she and Billy go on their first date. Julie has a sister named Daisy who has bested her in everything since she was a child.

* Shun Kazami (voiced by Chihiro Suzuki and Zachary Bennett): Shun is a boy who is the former first ranked Bakugan Brawler who later moves down to sixth position. He is a master of Bakugan, and is also Dan's childd friend. Shun is a loner, a boy of very few words, yet is willing to help his friends at every turn almost. Shun is a Ventus battler. His Guardian Bakugan is a Ventus-attribute Skyress (voiced by Chiharu Suzuka) whom Shun received from his comatose mother in the hospital. He approaches Bakugan like a ninja. He lives with his grandfather (who used to be a famous ninja warrior) who once expected Shun to follow in his footsteps instead of playing Bakugan. Shun once leaves the brawlers when Dan says they don't need him. But after brawling Komba, Dan appears and asks for forgiveness which Shun accepts.

* Alice Gehabich (voiced by Mamiko Noto and Emilie-Claire Barlow): She is a girl from Moscow. She sometimes plays Bakugan because she has the evil Darkus in her control, but knows almost everything about it. Michael Gehabich is her grandfather, but after learning that her grandfather became Hal-G and works with Naga, she constantly worried about him. Alice usually just gives advice to the brawlers, instead of battling. Alice and Marucho are the 2 brawlers who mostly use strategy. However, unlike Marucho, Alice gives her strategies to the brawlers. During the middle of Season 1 she left the Brawlers after finding out that she was Masquerade out of intense guilt over what she did as him, but later returns as Masquerade in time to save Dan and Drago. Once she saves them Masquerade permanently leaves her body (which Alice at first resents because she believed that she needs him), but leaves Alpha Hydranoid for her to control, although her secret Bakugan is Darkus, which she hardly uses because of their evil nature.

[edit] Doom Beings

* Naga (voiced by Hideyuki Umezu and John Stocker):
o Hal-G (voiced by Masaharu Satou and Ron Pardo):
o Masquerade (voiced by Soichiro Hoshi and Lyon Smith): He used to be the first-ranked Bakugan player before he left Alice's body. His 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. He is a Darkus brawler. He is revealed to be Alice in episode 38 and his origin is revealed in episode 39. Masquerade came to life when negative energy changed Alice (who doesn't know she is Masquerade or what happens when she becomes him). Darkus Hydranoid is Masquerade's guardian Bakugan. He battles with Dan in episode 38 and loses. He is actually Alice, but Masquerade disappears from her body (although at first, Alice doesn't want him to leave).

[edit] Secondary characters

* Michael Gehabich (voiced by Masaharu Satou and Ron Pardo): Alice's grandfather who created a portal to Vestroia.
* Kato (voiced by Masaharu Satou and Ron Pardo): Marucho's butler.
* Klaus Von Hertzon: He was once the second ranked Bakugan player, but later moves down to rank 4 after being defeated by Masquerade. He is an Aquos battler and his guardian Bakugan is Aquos Sirenoid. He sent Marucho's Aquos Preyas into the Doom Dimension. He somewhat has a crush on Alice.
o Chan Lee (voiced by Candi Milo and Stephanie Mills): The third rank brawler that appeared in episode 14, and was recruited by Masquerade. She uses Pyrus attribute Bakugan and her guardian Bakugan is Pyrus Fortress. Dan Kuso beat her on episode 16. Pyrus Fortress gets sent to the Doom Dimension in Episode 26. She is reunited with him sometime around episodes 32 and 36. She has a crush on Joe and at the end of the second series when Dan is on his date with Runo, she and Joe can be seen together in the background. At the end she and Joe are going out. In episode 49 Chan rescues Joe from Hal-G using her martial arts moves.
o Julio Santana:
o Komba O'Charlie:
o Billy Gilbert: Julie's childd friend and 10th Ranked Bakugan Player. He defeated Julie when they first battled, but lost in a rematch, and lost 9 more times when he was under the control of Masquerade. Once while battling under Masquerade's rule Billy almost sends both Gorem and Julie to the doom dimension. He is shown to like Julie in episode 47, "Here's mud in your eye" or in the Japanese version, "Good night baby". At the end of the series Julie asks him if he would like to go on a date some time, and he agreed. Also, at the end of episode 47 Julie makes it known that the two are boyfriend and girlfriend. It is assumed that they are still going out.

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