Currently playing the second game, here are my thoughts thus far on the characters:
Altaïr Ibn-La'Ahad: INTP 5w6
Ezio Auditore da Firenze: ESTP 7w6
Desmond Miles: ISTP? I dunno.
Dr. Warren Vidic: INTJ 1w2
Al Mualim: INTJ 1w2 or 1w9
Robert de Sable: INTJ 1w2
The Other Crusade and Saracen Leaders from the first game: INTJ's 1w2's, except Majd Addin, who's definitely an 8w7, not sure on mbti type.
So any thoughts?