The guy that became a girl when he reincarnated was gay from the start.
It's true that that doesn't really have anything to do with gender identity so D is clearly trolling, but I just wanted to point that out. He spent the longest time in denial though, and even confessed to the class beauty with the intent to get rejected just to cover it up.
The rest of the reincarnations are still pretty ironic though, for what are supposed to be the forms most compatible with their souls. Not that the goblins are actually all that violent or crazy.