The Boys: I Became The Soldier Boy

When Kevin wakes up, he finds himself transmigrated into the world of The Boys. The timeline is right at the very beginning of Season 1, and he has taken over the body of Soldier Boy... Fortunately, he has awakened a system, but this system is a bit bizarre… It's called the “Child Education System.” No matter what methods he uses to educate Homelander, change him, and guide him onto the right path, Kevin will become even stronger!! Educate Homelander? Then why stop there? Why not educate the entire Seven all at once? No, actually, why not just straighten out the whole damn Vought Corporation! — Description from novelcodex.org