http://www.fimfiction.net/group/204571/my-little-yandere
Is there a reason, in a series where most of the cast have proven to be crazy, there is a lack of Yandere ponies on this site? Especially with all the Fillyfooling?

5675892 Probably because they're not crazy, it was just poor attempts at comedy. Also I think it's mainly because no one actually thought of it until you brought it up just now.

5675892
To put it simply, the exhibited disorders are mostly counterproductive if you expect a yandere psychotype to emerge. A few of the characters have some potential to go yangire with proper motivation, but there`s very little option out there for yandere. You could possibly make a case for Starlight Glimmer, and if you got creative with backstory/continuation maybe Luna and Chrysalis. The rest would require a harsh rewrite to get anywhere close to yandere type.

I could possibly see Lyra or Bon Bon going Yandere, but not ponies like Fluttershy or Rainbow Dash. To be honest, the only real pony who could actually go Yandere is Pinkie Pie.