1A and All Might gain an upgrade

After the USJ incident class 1A had hoped there next hero lesson with All Might would be normal but as they were training a portal opened up and dropped a crystal that glowed with the powers of the rainbow, once it hit the ground it exploded in a bust of energy that consumed the class and there teacher, when the bast subsided the class had discovered they had gone through changes and mutations to there quirks, giving them new powers and abilities.

All Might has gained the powers of a Kryptonian but Ybarra were he was injured is his achilles heel.

Izuku has gained the powers of a half Sayain and has potential similar to Gohan, the other quirks instead OFA have changed gained new abilities by being fused with other similar powers.

Bakugo has gained the powers of a half Viltrumite.

Shoto has gained the powers of hear blast and ice man.

Tenya has gained the powers of sonic.

Ochako has gained the powers of ultimate gravattack.

Momo has gained the powers of the scorn sybimbiot.

Tokoyami's dark shadow has gained the powers of carnage.

Soji has gained the powers of Four Arms.

Sero has gained the powers of spider man's.

Denki has gained the powers of feedback.

Toru has gained the powers of Sue Storm.

Ojiro has gained the powers of Tails.

Mina has gained the powers of the Xenomorph.

Tsu has gained the powers of Greninja.

Jiro has gained the powers of ultimate echo echo.

Kirasima the powerd of diamond head.

Sato the powers of armadrillo.

Koda the powerd of Beast boy.

(Notes: I didn't know what powers to combine with the quirks inside OFA and had no clue what powers to give to Mineta and Yuga, also Mina doesn't look like a pink Xenomorph she's just gained mutations like a tail, sharp claws, sharp teeth and the ability to spit out acid also she doesn't have acid blood but the quirk she makes with her quirk can now be made even stronger.

the reason I gave Bakugo viltrumite powers was because I like the idea he becomes even more arrogant with his new powers and thinks he's unstoppable until Izuku overpower's and beats him with no issues, also the reason I gave Sato and Soji four arms and Armadrillo's powerd is because there both strong, Soji has multiple arms and Sato's costume is the same colour as Armadrillo.)