Mark is a young boy who is intelligent, creative, and determined. Mark, similar to his dad in a few aspects, is a sensitive and polite boy. He has a very effeminate attitude. His femininity eclipses even his father's as he loves to wear girl's clothes, paint his nails and wear girl's jewelry even though he does think of himself as a boy. His family is very accepting of this. His grandfather, Dan Conner, was a little skeptical at first, but he quickly grows to respect his choices. It is later revealed that he actually is attracted to boys.