He was famous - from Gell-Mann to Dyson to [insert famous field theorist] - for being deliberately incomprehensible when explaining himself, very stubborn when it came to new ideas (to an almost ridiculous extent if Murray Gell-Mann was being serious) and almost literally obsessed with mathematical beauty over matching experiment.

Feynman was also flawed, but more as a man than a scientist.

Edit: A lesser-known but still very important particle physicist, Tom Kibble was known for being extremely humble and straightforward: https://www.youtube.com/watch?v=glHr9yrV2AI