D is a red male fox with orange eyes.
- He likes to dress up like a doctor.
- He wears a white coat with his letter and a light reflecting disk on his head.
- D helps out his friends if they have a disease.
- He is one of the few Letter Critters to wear clothes.
- D gives out donuts to his friends if they were good patients.
- D has a determined personality.
- He lives in a dark red house on Daffodil Drive.
- His real name is Danny.
- His birthday is on December 8.