Kazutoro and Baji

Kazutoro: Hair: His signature hairstyle is a wolf-like cut with black and yellow (highlighted) strands that stick out randomly in different directions.
Tattoo: He has a large tattoo of a tiger on the left side of his neck that extends to his shoulder.
Details: He wears a bell earring in his left ear, which jingles softly when he moves. He has very soft, almost childish features and a sad, sometimes wild, gaze.
Kazutora is a deeply traumatized teenager. His behavior and motives are impossible to understand without knowledge of his past.
Psychological instability: Due to childhood domestic violence (his father beat him and his mother), Kazutora's psyche was already fractured even before the main events. He desperately searched for a place where he would be loved, and found it in Maika and Toswa.
Distorted Perception of Reality: Kazutora's greatest tragedy is his psychological defense mechanism. After accidentally killing Maika's older brother (Shinichiro), his mind, unable to bear the weight of guilt toward his best friend, broke down. To avoid going mad from the realization of what he had done, Kazutora convinced himself: "I killed Maika's brother for Maika (I wanted to give him a bike). Therefore, Maika is my enemy, and I must kill him to atone for my guilt." This terrifying, distorted logic guided him for years.
Easily Manipulated: Due to his vulnerability and thirst for revenge, Kazutora became the perfect puppet for Kisaki Tetta and Valhalla.

Baji: Hair: Long, slightly wavy black hair that falls just below his shoulders. He often wears it loose in everyday life, but before a fight, he always ties it up to keep it out of the way.
Signature Smile: He has very prominent fangs, which makes his grin appear wild and even slightly predatory during fights.
Style: He's most often seen in Toswa's iconic black uniform. However, when he's in school, he tries to look like a good student: he slicks his hair back, wears glasses, and hunches over, which is rather comical given his tough personality.
At first glance, Baji appears to be an uncontrollable psychopath who relishes violence for its own sake. He'll beat someone up simply for "looking at him the wrong way," and genuinely enjoys a good fight. But this is just a facade.
Absolute Loyalty: Baji's devotion to his friends and the gang they created is boundless. To protect Toswa and his best friend, Mikey, he is willing to make any sacrifice—even to be considered a traitor.
Hidden Intelligence: Despite being a terrible student at school (he struggles even to read complex kanji), Baji possesses incredible intuition and strategic thinking. He is the only one who immediately sees through the plot's main manipulator, Kisaki Tetta.
Self-sacrifice: Baji is willing to bear all the world's pain so that his loved ones are happy. He prefers to act alone so that none of his friends are harmed.