Lily Evans-Potter (because after her and James started going out, she was an honorary Marauder). Dancing. Although both James and Sirius could ballroom dance due to their pureblood upbringing, Lily could do any kind of dancing. Seriously. Even breakdancing and swing. Every kind. She started trends at Hogwarts dances and people would often form a circle around her to watch.
Oliver and James Phelps (The Twins), Domhnall Gleeson (Bill Weasley), Matthew Lewis (Neville), Evanna Lynch (Luna Lovegood), Rupert Grint (Ron), Emma Watson (Hermione), Tom Felton (Draco Malfoy), and Bonnie Wright. Where's Dan!?