I just got a new idea and I'll probably repeat one.

Y'know Soul Eater? You know how they need a weapon and Meister? Let's throw a reincarnator that is a weapon in MHA.. Their weapon form? Eh.. you pick but Id prefer something unconventional like a pickaxe.. a shovel.. and a Stop sign.. their user? Mmm... How about we spice it up a bit and make a Yandere Izuku still the cinnamon roll that wants to be a hero but let's make them quite stealthy and great with their analytics no? That might be overstepping it.. Oh Right I almost forgot since you can't kill in MHA... Let's say Every time they "Kill" a villian.. They just get a red ball of sins instead.. and for a witch soul replacement? Uh... Nomu?

Next is a girl turned into a MapleStory System thrown into MHA And the world slowly fusing with MapleStory allowing the quirkless classes and the heros stuck.. This will be fun if they can pop out via summoning as a vampire since I can't get enough of that.