So I did Disney princesses before, I am only doing the so called 'Princes' not going into the extended ones or any of the non royal Princes.
The Prince- INFJ-

(Incredibly hard, I know, but only someone supremely romantic would have the guts to serenade a girl in broad daylight.)
Prince Charming- IXFJ-

(Again, no idea, he had like, one line in the movie. But I just think he fits this type for some reason.
Prince Phillip- ENTP-

I don't know why, he just seems really smart and is more logical about things. For instance he doesn't flinch once from the period of being taunted by Maleficent, going to the castle and then slaying her.
Prince Eric-ISFP-

He loves his surroundings and he is very romantic also.
Beast- INTJ/ INFJ-
I think he seems very angry at first and kinda INTJ, likes solitude, shut off from everything. Although he could always be a very bitter and angry INFJ. Since he shows some naive traits early on like not knowing how to ask Belle to dinner.
Prince Adam- ENFJ
- He seems to change so dramatically by the end of the movie. The way he hugs everyone reminds of of an EXFP. But he is obviouslly very happy in that moment so I would be fine with ENFJ.
Aladdin- ENFX
- Sometimes he seems more ENFP (Dreaming about living in the castle.) Then other times he seems more ENFJ during his forward action fighting scenes. But more likely, he was just comforting Abu, so maybe he is ENFJ.
John Smith- ESFJ-

- I don't know, he just seems very selfless and caring of others. He seems genuiniely interested in learning about others.
Li Shang- ISTP-

- Quiet, Serious, focused on one thing, training, isn't good with emotion and prefers to do things rather than talk.
Prince Naveen- ENFP
- He seems really fun and I was tempted to say ESFP, but he seems pretty quick on his feet and clever. (Not to say ESFP's aren't.)
Flynn- ISxP-

For some reason, I keep thinking ISFP. Although he doesn't seem to be romantic in anyway. But I'll stick with that for now.
I will look forward to doing the extended prince/princess, hero/heroines of Disney some time soon.