Aadiv is unlucky cuz he's the first in alphabetical order and some unexperienced players vote and kill from who they see first. This also goes with Alicia, Ally, and other characters that begin with A.
Marley is SOMETIMES unlucky because of Marley & Me. Marley, the dog, dies in the movie and Marley shares that name so only people who know this kill her first for the laughs. I honestly didn't know this XD
Chlorine & Rita are unlucky due to not being human, but I barely see them anymore ;(