So is "Rainbow", at least at 1st
How has no one mentioned One Punch Man yet, FFS..?! If you haven't seen it yet, you owe it to yourself to do so.
+1 for "Youjo Senki" ("Saga of Tanya the Evil"); I've never loved a magical girl anime more. S/he's a middle-aged salaryman stuck in a little girl's body (and considers himself male, pretty much), so this sort of qualifies.
Another good one is "Boku no Hero Academia". While the protagonist is pretty young (middle school or thereabouts) they simply don't come manlier
. Bonus: He's NOT stupid or particularly "macho"; rather he's simply a good man
, no matter his age (which is why he gains his power in the 1st place from its origin). And he never whines ^^' .
And as an antidote to all this manliness (good as all the examples have been), you should finish off with "Little Witch Academia"
. (Yes, it's very good.)