Some comedians live and breathe their act, as it's who they are, as opposed to just playing a character, which is what Roy Chubby Brown does IMO (you only need to look at what he wears on stage for proof really!)
I watched a documentary about him a few years back, may have been on Channel 4 or something, and he came across as quite a nice guy. One scene that I remember was him and his crew having a meal in an Indian restaurant, and all the staff wanted their picture taken with him, which he was more than happy to do, having a laugh and joking with them all. I remember thinking to myself, "wow, he's not actually like he is on stage." Whether that was all 'put on' for the cameras as they say is anyone's guess, but it looked fairly genuine to me.
So yeah, whilst sometimes his material is like marmite, in which you either love it or hate it, the man himself seems to be completely different from his stage persona, seemingly very pleasant.