Back in the day, when I was modding MGD, the original Celica concept was... yeah she was very much a yandere, to put it lightly. Straight up rapes you if you used her spell too much. Quit working on it before I got to her, and DD's Celica is a very different character (much more fleshed out), but there's still a bit of crazy in there.
Aspasia can get VERY possessive in the long term, imo the highest ranking stalker but only if you meet a fair few requirements. Imagine a possessive slime gf getting uncomfortable and clingy if you're not inside her half the time.