One of the tragedies of the 20th century happened during the political attacks on comic books in the 1950s. Among the long list of complaints directed at Superman was an attack on his "pleasantly fat bottom". Thus was inaugurated the tradition of superheroes with skinny little flat asses.
Angelo, despite his lean and lanky physique, has a pleasantly fat bottom.
(edited 12-23-2020 to correct a couple of small errors)