Yandere 日本动漫 Characters 粉丝 club 

Actually, Rena from Higurashi is a yangire, not a Yandere. Shion is Higurashi's Yandere character. But I'll join. :)

^Then, would a Yandere character be someone who acts out of jealous or obsessiveness over another character?

^ Yes, in the sense of love. A yangire is similar to that but different in the sense of personality. I understand the mix up though; I used to get yelled at all the time on MyAnimeList for calling a yangire a Yandere. ^ ^;;

^I am lucky that you gave me the idea, then, because anime fans can be pretty brutal, at times. ;_;

^ Indeed. ;.;