waifu killer

Best definition
waifu killer
1) A Waifu Killer is someone who cosplays your favorite character preferable female anime character and you don’t like the

person for cosplaying the character you like.2) Someone you dislikes who cosplays a favorite character of yours and you really don’t want to see them as said character.

1) Man, why did Antonio cosplay Hestia, what a waifu killer!

2) She had to cosplay three of my favorite characters, damn waifu killer!