Guts from Berserk is comparable to Denji from Chainsaw Man. Denji was able to maintain himself despite the fact that they are antiheroes who came from nothing.
Denji from Chainsaw Man is simple to write off as an out-of-control pervert, but that glosses over the socialization—or lack thereof—he had as a child.
The most recent shonen deuteragonists to garner parallels are Megumi from Jujutsu Kaisen and Aki from Chainsaw Man, however they differ from one another more than they seem.