Stain from My Hero Academia is known as 'The Hero Killer'. He believes that those who become 'heroes' for fame and money are unworthy of being called heroes. So with the assistance of his 'Bloodcurdle' Quirk (which he can use to temporarily immobilise people after he tastes their blood), he went out on a mission to kill many of the MHA universe heroes. Before he was stopped, he killed 17 pro heroes, and disabled 23 others to the point of being unable to make a full recovery.
Now, let's say some cosmic figure with the ability to transport people to other universes shows up, and transports Stain to the universe of The Boys. "So, you hate people who call themselves heroes but are really only doing it for the fame and the money? Well, here's a whole world full of them. The Vought corporation ENCOURAGES the sort of heroes you despise the most. So go after them!"
So, how would Hero Killer Stain do against the Supes of the Boys universe? This of course includes The Seven, with such self-absorbed fame seekers as A-Train and the Deep, and outright monsters like Homelander. As well as Black Noir, Queen Maeve, Translucent, and former member Lamplighter.
And then of course there are people who aren't part of The Seven, but also are important. Like Soldier Boy and the former members of Payback - Crimson Countess, Gunpowder, and the TNT Twins.
So, how would Stain fair against any of these people? Would any of them be able to defeat Stain despite his Bloodcurdle quirk?
Bonus question: In MHA, the only hero Stain respected was All Might, who wasn't motivated by fame or money. Would there be any Supe in the Boys universe Stain would respect? Even Starlight?