Unlike the other kids at the academy, Jeanne Foucault wasn't mistreated by Norman Osborn, and was allowed to work on her skills. Finesse is a polymath and can learn any skill very quickly. She has a photographic memory and can copy different fighting techniques. She's an ace at everything except social interaction, and her bluntness and aloof demeanor alienate her from the group.
Powers and abilities
Finesse has been a polymath since the age of five, which means she can learn a vast amount of knowledge at an accelerated rate - anything from languages, varied skills, fighting techniques, etc. Likewise, she is good at sports and can hack into computers.