Shana - obivously for being tsundere, moe, and awesome
.
Yuji - I always liked his character, and then Episode 19 of season 2, he was awesome enough to be come a favorite.
Pheles - Curse my weakness for long green hair on girls
, I always seem to find them likable, and interesting.
I still liked most of the other characters, just not enough to be favorites, also I think this is least number of characters I've voted for on a poll yet xD.