If you're looking for manga similar to Mayoi Neko Overrun!, you might like these titles. All recommendations are made by Anime-Planet users like you!
Regular high-school boy Kaji Rikuo’s life is suddenly interrupted by a cute girl with cat ears named Vanilla. According to Vanilla, she was created from different mixtures of animals sort of like a chimera by her master, Ibu Kiriko, whom apparently has it out for Rikuo. Confused as to why somebody would want revenge on him, Rikuo become friends with the clueless and cute Vanilla. However, Vanilla can turn into a vicious animal able to hurt Rikuo with a simple command from Kiriko…
If you want to read something similar, but with much less annoying characters and way less fanservice, then give Come Come Vanilla! a try. While it is almost as cliche as Mayoi Neko Overrun! most of the cast (if not all of it) is quit likable (yes, there are no violent tsunderes or anything like that there).