Here's a few I use as a faecat otherkin :

Nya / Nyan / Nyas / Nyanself

Mew / Meow / Mews / Meowself

kyu / kyute / kyus / kyuteself

And I also like to search 'NPT' on tumblr.

mew/mews, purr/purrs, luv/luvs, meow/meows, kit/kits, cute/cutes, nya/nyas.. etc :)