How many baboons could you take in a fight?

No i know well, the thing is, i don't really know where those characters come from, i guess from some animu or something i haven't seen :<

Umineko no naku koro ni, it's a sound novel.

She (the poster) is most likely Devil's Sunrise

I am not Devil's Sunrise.

and the character, is from an anime she seems to be obsessed with

Although there is currently an anime adaptation of it airing, most of the images are sprites from the sound novel, which has an art style very different from the anime.