I was going to say maybe they were INFP 9s (or 6s) but then you're one and you don't identify...
I don't think he's a INFP - I always thought he was a INFJ. He has more of that J directness and forcefulness.I'm not sure if he is and INFP or not, but Billy Corgan of Smashing Pumpkins always wrote in a way I could relate to.
Probably the best Pumpkins albums came from a time period where he was married to someone who hated his music and from interviews largely seemed to be in an unhappy marriage (Gish, Siamese Dream and Melancholy and the Infinite Sadness)..
There is something rather dark about him, though