Kai Hiwatari

Initially appearing as a cold and solitary "bad boy," this stoic Blader harbors a deep-seated rivalry with Takao due to his intense focus on power and solitary training. Though his harsh childhood left him indifferent to others, his journey through teams like the BladeBreakers and Demolition Boys sees him gradually opening up. While he once viewed Takao as an annoying nuisance, he eventually develops a profound bond with him, transforming from a lonely loner into a respected, natural leader.