Donatello Silver is the older brother of Geo and takes the form of a unicorn while in Equestria.
Donatello is Geo's older brother and works as a mercenary. Donatello shows great concern for his broght reguarding his safety and family matters. Donatello thinks Geo's garden is girly and would rathe rhave him train to join the family business.
Donatello appears back at the school, after he did a mission, and takes up residents in Geo's dorm-room. He becomes concern about Geo dealing with Havok, having no defense skills.
- Donatello is named after a male meerkat from the Moomins Mob who was named after a Ninja Turtle who was named after a famous artist.