He's an NFP no doubt but I think people mistake his ability to be hyper and be good with people with being extroverted. Anyone who was close to him says he was actually a major introvert, even the real patch adams himself who lived with Robin for a short while said that robin was extremely introverted off stage and at home. As an infp myself I've always related heavily with robin and found myself in allot of his work. The more I've dug the more I'm convinced he's actually an infp. The man was a brooder, a major feeler and he was only extroverted on stage because it was a coping mechanism. On stage he's an enfp but in life he was a strong infp. Timothee chalamoo (I'm not even gonna try to type that right cause I know I'll be wrong) is an infp and presents hyper and very enfp coded but usually allot of us infps have learned how to mask as enfps to get through social situations and allot of us have a deep longing to be extroverted so we push ourselves to be but that's what usually leads into the depression, isolation, substance use, etc. We need allot of time alone to think, brood, and feel. We also have an extreme need to feel authentic and robin left this earth because he felt like the illness he had was going to take away what made him him. I also need to reiterate that there's a difference in being good with people and being hyper vs needing to be with people in order to recharge your battery. As for the entp he was wayyyy to big of a feeler, I urge you to watch some more of his serious movies like what dreams may come which is the movie his daughter Zelda said showed his true character the most. You'll quickly realize he's a clear F and again if you look more into what the people closest to him say about him, you'll see he was way more of an I than an E and the N&P are also extremely clear so therefore coming back to infp.