Don't forget that the rodent people exist, but barely. Meccians. Had to look up their name because I couldn't even remember. 2 npcs, ones a quest enemy, the other has a single non-repeatable sex scene. And...I actually had to look it up. Svern, the npc isn't listed on the wiki as a half meccian, but Whisper looks all furred in his art while Svern is garbage anime kemonomimi bullshit, being human with animal ears, tail, and spicing it up with furred arms (feet are never mentioned so who knows). The wiki says they can be born either with fur or without (beyond stupid, pick one, are they furries or are they weebs?). Despite all that, still no transformatives for them. Probably the only race you can't transform into, not that I'm gonna check.
On a tangent, even if coc2 added a transformative for them, that would make all three fenoxo games have a mouse transformative, but none for rats. Where's the love for my rattos?