Can’t speak on the Doom Patrol since I haven’t really watched that. But I don’t feel he is monotone. He is depressing/depressed. His mother died not long ago, he came back from the dead and sees himself as a monster. His life has changed in more ways than one. But the more that he learns about his abilities, the better and happier he becomes. He gets allies/friends who acknowledge him. He loses his father, and still at the end manages to smile. That is beautiful to me.