'Ketsu' is one of a few names this particular character goes by, since it's basically just...me! This is my primary fursona, and was the first of this set of furry dolls to be made. While it is, effectively, a cat, in my own personal universe for all these characters this species is called (a) Kordil (it pluralises like 'sheep) and is originally from the planet Kord.
A couple of my other characters are also Kordil, so they share the same base pattern, but with adjustments both in terms of main body (breasts or lack thereof, waist-hip ratio, height) and in terms of extra features. Primarily, all Kordil have individual kinds of tail! Ketsu's looks like just a massive fluffy black tail, but is actually a portal to a pocket dimension. It was mostly inspired by how Giratina appears in Platinum, how it drips shadows like ink before it fully forms on Spear Pillar. Technically, all the solid black areas on Ketsu are portals to the same area, but the tail is by far the most accessible.