Martin Mystery is the main protagonist and the love interest of ??? appearing in Martin Mystery. He has blonde spiky hair and green eyes. His main outfit is composed of: a red and yellow short sleeved unbuttoned shirt under a white shirt, a blue U-watch on his left wrist, gray pants and red and white sneakers. He is voiced by Samuel Vincent. At his age, he is 16 years old.
- Gerald Mystery (Father)
- Diana Lombard (Stepsister)
- ??? (Love Interest)
- Jenni Anderson (Biggest Fanatic)
- ??? Jenni