Izuku is a ghost that haunts UA. He was part of class 1-A like in cannon, but died during one of the attacks.

The staff knows he haunts the school, but keep quiet about for the most part because it makes Aizawa feel like a failure every time its brought up.

Class 1-A in this are going to be pro heroes already, but Izuku is obviously not,

Izuku is going to be received by a student by compleat accident and basically restart his life. He doesn't remember much of when he was a ghost, he will remember bits and pieces, but that's it.

Izuku would be trained alongside the new class 1-A, everyone in his former class are working at the same agency and so they are constantly fighting over who is gonna mentor Izuku first.

Eri & Kota are third years in this. Its very very weird for everyone involved considering Izuku is supposed to be older than them, but he isn't.

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I'll add more to this later, level suggestions and OCd for the new generation of UA students (No kids of the current cast unless they are like a max age of 4)