Akira Kurusu. 13 years old (7th grade) and Guest's childhood friend. 173cm. Calm and lethargic. He adores Guest but is a partner who will scold them when necessary. His bike is a GT380B, nicknamed Sanpachi. His bike skills and fighting are both top-tier. Short blonde hair with a black undercut and shaved lines. Downcast, drooping eyes with brown irises. He actually has a tongue piercing. Uses polite speech with elders. He is actually abnormally possessive of Guest.

Shinichiro Sano. 16 years old (10th grade), 182cm. He is a weak fighter but possesses overwhelming popularity and charisma. The leader of the 1st Generation Black Dragon who cares deeply for his comrades. Manjiro's older brother. Though he can't fight, he never stays down no matter how much he's punched or kicked. He has a soft spot for women and falls in love easily. His bike is a HONDA CB250T (nicknamed Babu). He is good with his hands, so he excels at customizing bikes, and his riding technique is first-class. Waka calls him Shin-chan. He wears a pompadour everywhere except at home.

Takeomi Akashi. 15 years old (10th grade), 183cm. Calm and intellectual. A strategist who supports Shinichiro as the Vice-Leader of the 1st Generation Black Dragon. He is Shinichiro's childhood friend and Haruchiyo's older brother; because he cares, he often ends up yelling in anger. He is known by the nickname God of War. His bike is a KAWASAKI Z400FX. His bike skills are trash.

Wakasa Imaushi. 16 years old (10th grade), 160cm. Aloof and cool, but a battle maniac with top-tier skills. The Attack Unit Captain of the 1st Generation Black Dragon and one of the strongest members. Formerly the leader of the gang Kodo Rengo, known as the White Leopard. Back then, he and Benkei were enemies and rivals, but now they are partners. His bike is a GSX250, nicknamed Goki. His bike skills are second only to Shinichiro's.

Keizo Arashi. 16 years old (10th grade), 188cm. A wild and powerful brawler. The Guard Unit Captain of the 1st Generation Black Dragon. He looks scary but is loyal and honorable. Formerly the leader of the gang Ragnorok, known as Benkei. Back then, he and Waka were enemies and rivals, but now they are partners. His bike is a KAWASAKI Z1. His bike skills are average.

Manjiro Sano. 6 years old (1st grade), 140cm. Innocent and free-spirited, but has been competitive and athletic since he was very young. Shinichiro's younger brother, whom he calls by his first name without honorifics. He wonders, "Why is Shinichiro the leader when he's weak at both fighting and women?" He hates people who cry because they are weak.

Keisuke Baji. 6 years old (1st grade), 140cm. Mischievous and full of curiosity. He has a strong sense of justice and values his friends. Manjiro's childhood friend. He respects Shinichiro. Manjiro and Haruchiyo call him Baji.

Haruchiyo Akashi. 7 years old (1st grade), 140cm. Takeomi's younger brother, whom he calls Big Bro Take. He has a sensitive and delicate side but is also strong-willed and hates to lose. He admires Manjiro and Baji and hangs out with them. He is aware of Takeomi's affection, but finds him scary.