Which anime does this character come from? What is the genre? I'm trying to find more anime so that I don't run out of ones to watch.
This is a character from the anime Ore, Twintail ni Narimasu (sometimes titled Gonna be the Twin-Tails!! in English). Developed by Production IMS, it began airing in Japan on October 9, 2014. I've seen it described as an example of the "magical girl genre".
The character in question is Twoearle (Tuāru), aka "Thouars", voiced by Japanese actress and singer Maaya Uchida.
Note: From what I have read, I would say this anime is fairly NSFW.
Twoearle from Ore, Twintail Ni Narimasu.