Kind of like a Chick Magnet... only it's a fictional character that is stereotypically known to make teenage girls squeal and shriek at first sight. Extra points if they're a badass, anti-hero or rough past. (Moar bonus points if they're trying to leave it behind.)
1.) Shadow the Hedgehog's low voice, cool demeanor and dark attitude made him the new Fangirl Magnet in the Sonic franchise.
2.) From day 1, we knew that Yami Yugi, with his lower voice, attitude and addiction to leather, would make him the resident Fangirl Magnet.