Randy Couture is pretty nice.
Jacare is nice, shouts everyone food and drinks but he's hella arrogant.
Nogeira brothers are literally some of the nicest guys on the fukn planet. (unfortunately never met Anderson but I believe he would be up there too)
Hatsu Hioki immensely respectable, but he's a Jap so kinda expected. (oooh racism)
Thread was started with a Mark Hunt pic. Met him briefly, he was ok, not that friendly, but it was at a grappling event where there was no alcohol, I've heard stories from a couple of peeps that met him about him being a scabby bastard and making any fans that wanna chat go buy him beers. I was shocked but they didn't seem to mind and came away saying he's cool.