AFO can't take One for All so he decides to be petty and make Izuku into a Nomu using a quirk similar to the Sludge Villain from EP 1.
Fizzy Slime - A green-to-purple gradient slime that shines in sunlight. It fizzes and bubbles with crystals in it. It makes up a good portion of Izuku's body, pretty much everything but his organs, face, and some of his hair are now slime. If you shine a light through it, you can see his organs and bones. He can control even the smallest amounts of it.
Fizzy Slime is made by the fusion of One for All and Slime Body. The crystalline structure of OFA dissolved into the slime. Eating it can give you a share of power. If Izuku spreads himself too thin, he won't be able to use the power of OFA until he brings himself back together and recharges.
He can still use some of the quirks of OFA, although they are all modified by the Slime Body quirk.
Smokescreen and Float are completely merged into Fizzy Slime and completely unusable. They instead altered the properties of the slime, smokescreen creating bubbles and float causing the slime to float up in globs like lava lamp fluid.
Fa Jin and Gearshift are difficult to use, if he uses too much they will cause his sludge to scatter on impact. This can be fixed by using Blackwhip.
Blackwhip allows him to control tendrils of slime in a more exact form than if he just had the base slime ability. He can also use it to pull himself together. The whips are covered in slime and just appear to be black forms within the slime.
Danger Sense is the only quirk that remains completely untouched. Although, it does makes his fizz increase.