I think mine was actually Madoka Magica - that was the first anime that I seriously watched from beginning to end. Before that I had watched Penguindrum, but it was kind of hard to follow and I didn't really get it, haha.
I guess this applies more to off-board roleplays, but I hate when a roleplay's website has this supertinyfont ALLLL across the board. Like... I can't read that. Please. Stop. ;_;
I think villains need a good motivation - something that makes sense, rather than just "I'm evil because I'm evil!" I'm very tired of seeing villains who are evil just for the sake of having an antagonist - I think it's important to make a relatable villain, or at least one that makes sense.