When a custom NPC sits, such a Vocaloid NPC, it stretches their body to creepy lengths. If you know the demon babies/pets glitch from the sims 3, it's the same glitch. I know the the player animation fits those models was they are also playermodels. When i sit, I look fine. I am willing to get a new addon to fit this. So if there is a addon for custom NPC sit, then just send me a link.