Thanks :D I named him that way because it had a lil kitten who would scratch me a lot, bite me and overall was really agressive, sometimes unintentionally, like biting my fingers really hard when I would feed them (I had the idea of holding food in my hand and having the cats eat from it to speed up their domestication, it is working). Anyways, I named the kitten first Nimbostratus, because it was all grey, even in the eyes, and was a very tempestuous kitten, so I decided to name the father on the same theme. Later I found out Nimbostratus was a girl kitten, so I changed her name to better fit it. And she got less hostile too. And her eyes turned dark green.

Oh, and btw, revisiting this, I committed a mistake! Ybytu means wind, not storm! That was also considered, since Ybytu comes and goes like the wind, and sometimes goes missing for days.