Monogatari series is kinda a popular one. Bakemonogatari, Nisemonogatari and few others, they made a lot of seasons of that series. Thou I assume not everyone like them, but I wouldn't call those a lesser know ones.
Majikoi could be called lesser know one, thou the game series is quite a popular one I think? So either way you could argue that both of my examples aren't lesser ones.
Not sure if I know any lesser animes/games. I don't really pay attention to what is know/liked, and watch/play what I like.
I think we do have a bit of slim girls already, thou at least by my definition of slim. Thou some find slim to be borderline anorexia hehe, or you meant slime girls to add to your list of animal girls, but personally I tolerate girls with some animal traits like ears and tail but being human overall, not full blown "furry" ones ;].