Interesting the character of Raphael is. He is probably the most realistic character of the books, series and the movies. Infact he I believe is the only realistic character in the whole series who is realistic and shows/craves for the basic human need of acceptance.
He is also a bit too realistic?
Undercover protectors of society unable to face society due to their obvious distinguishable traits? It's very very sad. They are the scum that protects the society. Raphael's character is the character the writers use to explore this this side of the story. Ah, a bit too complicated for kids I believe. This is explored more in the books than in the cartoons. The books were extremely violent (on many occasions it is seen that the foot soldiers or other enemies being killed or fatally wounded) and the Raphael factor is explored more in the books. I believe the books were meant for older teenagers and younger adults and the cartoon/films are meant for kids.