>>7462126D10 or DIO is a succesful beastbox design that works properly and assumedly has a functioning AI. D09(Dog) or Ghostdog was a prototype that wasn't fully functional and was thought inferior to D10. So D09 has a grudge against D10. Its sort've a Protoman and Megaman kind of deal I think. So D09 has a more primitive and less expressive head than D10, but is probably tougher.
Deepest lore.
