Maybe I am just talking to myself here, but one thing that has surprised me about Nine is how her spells have all turned put to be extremely reasonable. None of them seem too good or too weak. ASW did an impressive job on that score.
The only aspect of Nine that might need to be toned down is her teleport dash. It seems to have an incredible number of invincibility frames, to the point where people score hits off of random teleport punishes off of whiff attacks all the time. Azrael has something similar, but it is kind of his defining feature. This is just one of Nine's tools, among many. I don't think she is too good in general, but I could see the teleport getting a nerf in a later version.