idol-yandere 

A kpop (or jpop) fan who is very obsessive with their groups/biases. Is ready to bring down other groups that is growing more famous and bully the rival group's fans.
Doesn't allow people in their social cirkle to have the same bias as them and will get angry if this is ignored.

1.
"My friend asked me to pick a bias in Exo, but she got angry and told me I couldn't have same bias as her. I thought it was a joke..."
"She is probably and Idol-yandere"
2.
"It's so childish, the war between EXO-L and Army! Idol-yanderes are so scary!"

idol-yandere by Zombiehalo August 26, 2017