Possible Clues:

• John of TV's 'Sleepy Hollow'
• Actor John of the 'Harold and Kumar' movies
• ___ Chang, Harry Potter's onetime crush
• John of "Harold & Kumar" movies
• John who played Harold in the 'Harold & Kumar' films
• John who played Sulu in "Star Trek" (2009)
• Comedian Margaret or actor John
• Comedy actress Margaret
• Comedian who blogs
• Harry Potter's first girlfriend ___ Chang