Just something I noticed messing around in the lab.
Ryuuenbu (214P) and Hissatsu (236K) both do more damage as cancels and standalone moves than they do in-string. Not sure if this is true for the rest of the DOA cast, but for Mai, yeah.
Ryuuenbu's damage on NH while opponent is standing is 15+7, while in-string it's 12+6
Similarly, Hissatsu is 20+10 while it's in-string variant is 17+8
Just something I noticed, nothing too major. While her damage output is very good, she doesn't get much reward from extending threshold, so don't both CB-ing with Mai. Her stun game isn't particularly strong anyway since her strings are telegraphed and she lacks a good mid K stun (besides 6PKK but that's in-string).
Something I noticed is that Mai's movement while juggling opponents is much further than most characters. Just using Hissatsu alone can carry an opponent halfway across the stage, so use that to your advantage to get that delicious wall damage. Especially with Kagerou no Mai.
I'd say Mai is primarily a CH stun-launch character (with like a metric ton of high and low crushes) with an excellent environmental game. Her wall damage is beyond amazing, she can get a +frame unholdable off of a wall juggle and Hissatsu has great mobility across the stage.
I am definitely liking her so far. She's up there with Mai and Phase for best DLC addition to the cast.
She has one major weakness though, and that's linearity. Even with tracking moves, Marie Rose can avoid most, if not, all of them with Minuet. She's probably Mai's worst match-up at the moment IMO.