Fan Casting ''Grandpa with the moustache'' in The Boys: Brightburn

In the Post-Credits Scene for the film, we see Homelander waking up after passing out from blood loss. He finds himself not in Vought's headquarters, but in a chinese hut of all places. He then sits up, asking himself what he's doing here, when a voice speaks up, saying, ''Congratulations, sport. You've just found yourself the last opponent you wanna face.'' which makes Homelander turn his head. There, he sees a middle-aged man wearing a suit very similar to Homelander's. Homelander then asks, ''And who the f*ck may that be old man?'' which makes the stranger smirk, as he responds with, ''A Viltrumite.'' ending the film.