I was very curious about Adolf Hitler's personality type, but when I googled it I found guesses of probably all of the 16 types. This was the first sign I thought he may be an INTP since INTPs in general have the ability to blend into any type and confuse everyone (chameleon). So I did my own research on his personal life using this source
[the website is called history place and google worldwar2, rise of hitler. this is my first post so apparently I can't insert any links until I have at least 15]
and confirmed that he was a very misguided and troubled INTP. He had many talents as a child, but the impact of his life experiences drove his talents toward great destruction.
..what I should also note is that Albert Einstein was also an INTP, but obviously had a much healthier life experience because he accomplished positive things for society (and himself) and was very self-actualized before he passed away.