Chumbucket gets a few good lines in the game. If you forget and get into your car enough on the left side instead of the right (Australia drives on the left side of the road) he will chide you for it. He also has a great one liner comment straight out the the movie "Airplane". You just have to interact with the right
friendly NPC to hear it. However, his abnormal fear of ,and whinning about, the Buzzards will begin to wear thin toward the end of the game.
One other comes to mind and it was one of the sidekicks available in Fallout: New Vegas.
The character was a friendly Ghoul named Raul Tejada who always had a funny self depricating line or two. I was dead certain that he was voiced by Tommy Chong of Cheech & Chong fame. He just had that stoned Southern California Hippy vibe. Much to my surprise, the voice actor was instead the veteran character actor Danny Trejo--you know the guy who always plays evil looking Latin villians. Trejo's parents were Mexican American but he grew up in LA in the 70's so it makes sense.