Maybe I should keep out of typing people threads, it's kind of pointless.
Anyway, say if De Niro was an ISFP (I don't know what his actual type is) this:
...looks very much like taking in information through his senses (Se) and processing it with Fi and Ni. Which is exactly what an ISFP would probably do if they were to become an actor.Bob [De Niro] was just insistent on absolute naturalism and realism. He’s a student of human behavior. I’ve never seen an actor as famous as him walk into a room and do what he does, which is he just disappears. He absolutely disappears. He sits there and he watches everything. He sees absolutely every interaction. The reason his work remains so good, and he remains so relevant as an artist, is because he sits there and he is constantly just downloading human behavior. Oftentimes actors become famous and they end up doing imitations of their own performances, or imitations of what they think people might do in certain situations. Very few of them sit there and do the kind of rigorous observation that it takes to embody people in a subtle, nuanced and real way.
Edit: To elaborate:
Fi:+It is like having an internal sense of the “essence” of a person or a project and reading fine distinctions among feeling tones.
Se:+We notice relevant facts and occurrences in a sea of data and experiences, learning all the facts we can about the immediate context or area of focus and what goes on in that context.
Ni:= Something similar to what De Niro is described as doing.This process can involve working out complex concepts or systems of thinking or conceiving of symbolic or novel ways to understand things that are universal.
I'm not saying that is what he's doing but it might be, and there's no reason to rule it out.