Love Hina's artist got his start doing Lolicon Doujinshi of Cardcaptor Sakura, IIRC.
The artist of the first Pokemon manga, Toshihiro Ono, is better known as Kamirenjaku Sanpei, famous for his "Anal Justice" series of Hermaphrodite anal pornographic comics. (And yes, he's done Cardcaptor Sakura books, too. Dunno why.)
Any weeb that suggests that a dirty doujinshi or two in an artist's back catalog is a deal breaker is a poseur. Japan does not give a fuck. They do not give a FUUUUCK. A lot of artists get their start doing fanart and fanbooks, then move on from there. It's only with the rise of Tinami and Pixiv that things have started to shift.