oh man i loved this show. was might favorite when back then. but this is what i think of the characters.
Michaelangelo: ESFP (Artisan)
Raphael: ISTP (Guardian) -
too spontaneous to be an ISTJ. yes he does have a Guardian look to himself (protective of michealangelo and others). but he has a issue with leonardo(i think that is one of the main plots of the story isn't it?) when it comes to leadership which is quite common to ISTPs.although they themselves do not wish to be leaders(laid back,etc) they have a CHARACTERISTIC rebellious trait. they wish to be left alone. whereas leonardo wants the whole team to follow the rules and be traditional. which makes Raph pretty pissed off. and he is the one who always gets pissed off( which is understandable due to their appearance) and leaves the team without explaining himself.
i think this ISTP trait is due to the inability or the dislike to express themselves to others using words. making them loners(showing their dislike) and HERMITS. which is quite obvious in ISTPs.
on the other hand ISTJs are quite good with words and would express their dislike with a decision if they have one. and they will follow the Leader (common to all SJs). especially a one who has respect to his elders, rule bound, traditional and practical.
and he is the most athletic, strongest, fastest member of the team. and he beat Leo on the rooftop, fair and square.
Donatello: INTP (Rational)
unquestioned devotion to the rules and traditions taught by master splinter. ESFJ right?