Mewtwo's fair can also combo & kill confirm into itself out of a full hop nair on DI in (clip1)
& should your opponent DI away preemptively to escape the second fair, the first fair might just kill straight up (clip2)
To kill you need to be off stage tho but it works on stage too
Oh also I hit this at the local
Mewtwo’s fair used to true combo into itself in smash 4 and I’ve always wondered if it’s still possible. Checked with the hitstun calc and apparently under these specific circumstances—mid percents, DI in, frame 3 airdodge—it can actually work :0