Chonies is intelligent, as he often builds and repairs impressive gadgets. Chonies also has a possibly dark sense of humor. He can also express some anxiety when under pressure. Being a yes-man, he usually lacks his own independence and opinions, and just follows Garbage around. Chonies usually wears a red collar on his neck, most likely given to him back on earth from his owner, Andrew.
Chonies is not actually naked all the time- he's just wearing a skin colored suit as pointed out by Ed.