hmm.. The old man from 'The count of monte cristo', who helps Edmund Dantes escape, might also be worth considering. (In fact that seems like a very decent guess, after giving it a few more seconds of thought)
That's what I thought too.
Dr. Frankenstein, in the original classic, seems likely to be an INTP. The monster is also a Rational. My best guess for his type was ENTP (his excellent debate skills and impulsive decisions) or ENTJ (his more dominant streak)...not sure. It struck me as ironic that the monster would be an ENTP Inventor.
Aramis, one of the Three Musketeers, is an INTP (in the books, anyway). Incidentally, the types of the Musketeers are INTJ (Athos - leader), ESFP (Porthos), INTP (Aramis), and ESTP (D'Artagnan). I am amused that half of the team consisted of introverted Rationals.
Don't agree with Spider-Man or Sherlock Holmes as INTPs--in the comics and books, anyway.
Spider-Man--
- The first thing he decided to do when he got his powers was to fight in a public ring in front of hundreds of people. (Extraversion)
- The supervillains were always screaming at him to shut up. But Spider-man just never stopped cracking jokes. Snappy remarks are more an ENTP thing than an INTP thing. INTPs are just as witty, but slower about it.
- Despite his early misanthropic period, Peter eventually ended up becoming more popular than Flash, the school jock, and getting his pick between Gwen Stacy, Mary Jane Watson, Betty Brant, Felicia Harding, and Flash's old girlfriend.
The movie version was introverted, though.
Sherlock Holmes--
- Went to great trouble to prove his conclusions (not INTP)
- Able to impersonate people flawlessly, an expert actor (argues for E)
- Liked to talk out the problem with Watson; this often led to him solving the case (Extraverts like to think aloud)
- Runs his own business (ENTP entrepreneur)
- Solved cases in leaps of intuition, deduction (NT)
- Had untidy flat (P)
- Strong background in chemistry and certain fields of applied science (NT)
Mycroft, who sat in the background reading and thinking in a club where nobody was allowed to talk, is a more probable INTP.