Vanilla seems good. With Tacca and the other weakness damage+ she would be nice. She is basically a 100% critXweak on everything with weakness. Good brainless attacker. She was better when she came out though. Power creep you know.
I'd like to get her but I have to save gems for the next non knights girls announced on last main story chapter. I don't know why but I guess they will be as mandatory as Ancient knights.

Nazuna day sepacial stage granted me 3894 R-shards for basically half day of afk grinding. I don't really have worth it girls to use them on but that's nice I guess.