The choice is too limited for me right now... OK let's move to the future.
Sakura Neko is my favorite, he (maybe she) normally do illust for LN.
Until now he (maybe she) only draw 2 charector and both 2 not appear on Nutaku yet.


Usashiro Mani (the white lewd rabbit lol) is my another choice.
He (maybe she) draw a lot of pron for several years by his (or her) name and circle.
Until now he (maybe she) design 5 charector for FKG, only one appear on Nutaku.


Right now Takto who draw Acacia, Cherry, Sakura etc is champion of FKG illust in number of charector design.
I think he (maybe she) already design around 30 charector up to current patch.