Dan is a 12 year old[citation needed] boy who loves Bakugan. His greatest ambition is to be the number one battle brawler in the world. He is a Pyrus battler. He is frustrated easily. His guardian Bakugan is the Pyrus-attribute Dragonoid (nicknamed Drago). He is in love with Runo but doesn't confess until the end of the series, when they are seen on a date together. In the anime television series, Dan is voiced by Yu Kobayashi in the Japanese language and Scott McCord in the English language. Drago is voiced by Keiji Fujiwara in the Japanese language and Jason Deline in the English language.

Runo is not your typical pre-teen girl. 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 the Haos-attribute Tigrerra, who is very obedient to her master and powerful in battle. Runo hates when people think that just because she is a girl, they can beat her. At the end of the series she and Dan are seen on a movie date. In the anime television series, Runo is voiced by Eri Sendai in the Japanese language and Julie Lemieux in the English language. Tigrerra is voiced by Atsushi Ono in the Japanese language and Stevie Vallance in the English language.

Shun is the former 1st ranked Bakugan player who later moves down to sixth 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. He is a Ventus battler. 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. His Guardian Bakugan is the Ventus-attribute Skyress whom Shun received from his comatose mother in the hospital. In the anime television series, Shun is voiced by Chihiro Suzuki in the Japanese language and Zachary Bennett in the English language. Skyress is voiced by Chiharu Suzuka.

She is a 14 year old[citation needed] girl from Moscow who doesn't play Bakugan, 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. Although unlike Marucho, Alice gives her strategies to the brawlers. During season 2 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. In the anime television series, Alice is voiced by Mamiko Noto in the Japanese language and Emilie Barlow in the English language.

Also known as Webmaster Joe. He lived in a hospital with his mother. The Brawlers used to think he was working for Masquerade, but he actually sent a message to the Brawlers to warn them that Masquerade was plotting against them. When he met Dan, he said he would only tell him if he was working for Masquerade if Dan beat him in a battle. In the middle of the battle he fainted. When he woke up they asked him to be one of the Brawlers. He gladly accepted. Sometime after he moved to the Brawlers neighborhood, he found Wayvern who had the Infinity Core inside her. Wayvern is a White One meaning she has no attribute. But her abilities in battle are considered Haos. Wayvern is Joe's guardian Bakugan. It is also revealed that Wayvern is Naga's younger twin sister. At the end of the last episode of Bakugan Joe and Chan Lee are seen on a bench together holding hands. Joe is the first person to beat Masquerade at Bakugan with his new bakugan Wayvern. In the anime television series, Joe is voiced by Souichiro Hoshi.