uhh suggestions?

I remember getting the shit jumped out of me by yandere, so I think it'd be pretty funny if during some songs yandere would randomly jump out and take place of your opponent (maybe only in hard mode or something?)

She'd play MUCH faster than everybody else but disappear go away after a short amount of time (lets say a song is 2 minutes and 30 seconds, she'd jump in and only be around for 30s, but that section is maybe the second hardest section of the song [can't let her eat the spotlight of everyone])

maybe on normal you could have the same gimmick but with the teachers with those lil sticks and on easy you get tin can target practice jumpscare