It is nice for you to have updated Pioupiou's TMNT turtle!
Do you have plan on updating more Pioupiou's TMNT turtles?
By the way, some issues I found in your Slash (please see my MUGEN screenshots below):
- the air forward dash......when it ends it seems to stay too long in the air before coming down....perhaps in the ChangeState part you can use Trigger animelemtime(10) = 0 instead of animtime = 0 because you set his Vel X = 0 with animelemtime(10) = 0
- three (3) fireballs in a row, since this fireball is big I think one (1) at a time is enough...
- his crouching light kick.......the 2nd attack seems not effective......
- the D,DF,F,a/b/c dashing attack special move seems to be an infinite (I could do 99-hit combo with that)
- the D,DB,B,a/b/c rolling attack special move seems to miss "thinner" P2 like KFM, I think you can add zero (0) Width and PlayerPush for the rolling part....
- the D,DB,B,x+y/y+z/x+z super move does not hit P2 at all.........well its active hitbox frame ends at animation element #16, but in the HitDef the AnimElem Trigger starts at #23???
by 
