>>279899715
Zangetsu (because that is who White really is) melded with Ichigo's Shinigami powers as his soul developed, so he deviated from the norm that other Hollows and Zanpakuto spirits follow, being both a reflection of Ichigo as his blade and the hollowfied part of his soul. Hollow's are defined by an aggression born from hunger, and a Zanpakuto reflects its wielder's inner self. Blending those components together gets you White, the part of Ichigo's that desires victory above all else. When you throw away everything to win, it's only natural that you'd be a little crazy