Just saying that Izuku should keep the vestiges in his mind until he dies, and the vestige world should turn from the old broken room where Yoichi was, to Izuku's apartment or even the UA dorms.
Imagine all the vestiges chilling watching Izuku's daily life live watching TV. Imagine them all fighting about some random subject in Izuku's mind and the poor kid getting a headache. Or the vestiges enjoying human things through Izuku's senses of memories like "everyone today we're having popcorns!"
Izuku never being completely alone, but having like a bunch of grandparents who are amazing fighters but are totally awkward with mundane stuff.
Also, if Toshinori died, he would get to be in Izuku's mind anyway so it'd be so funny and cute.
Also bonus points if the vestiges all have different favorite people, are the worst at relationship advice, would provide random facts about history and other subjects, would get sick whenever Izuku gets sick, etc.
Even more bonus points if Tenko-Tomura sometimes get to connect with Izuku's vestige world after what happened in the final battle with AFO, (specially when both Izuku and Tomura are sleeping), and Nana always tries to act like a grandmother (which is amusing) and and the rest of the vestiges mess up with him because sometimes they can get tired of only living Izuku's life and they want some news. Btw Yoichi and Tenko-Tomura bond over living with AFO, and Yoichi will never admit it but he feels a little responsible for what his brother did to Tenko-Tomura, so he's also like a little annoying but really cute grandpa to Tomura-Tenko.
