Haven't got just one favourite ped, I like a few for various reasons.
The guy in a green plaid shirt and cowboy hat that pops up in the 'hillbilly' towns like Palomino Creek, Montgomery, Dillimore etc...if you walk into him, he breaks wind or burps, saying 'Urrrgh.......double vision...', 'No naked flames please...' and 'Pardon the fumes' among other things.
San Fierro Rifa gang members make me laugh, especially after angering one of them when CJ replies that he is part of Grove Street Families. 'I LIVE FOR PAIN!!! URRRRRRGGGGGGGHHH!!!!!' The one I'm talking about is also funny when you crash into his car, the way he screams 'S**T!!!' and 'MY F***ING CAR, PUNK!!!!' Something about his voice just cracks me up.
The old Mexican guy that appears all over the state, blue plaid shirt and jeans. He's pretty funny too. His insults towards CJ are hilarious.