Christopher is a Banana Guard, he does not have any banana peel on his head and arms. He has brown hair and a navy colored badge with a crown on it on his body with a long strap under it. His spear is slightly differnet than a regular Banana Guard's spear.
Not much about him is known but as seen in the episode "Rattleballs" he becomes happy when he learns that Rattleballs died and says "Ooh, wow. Cool." Which shows that he dislikes Rattleballs. The death was actually a fake death organized by Princess Bubblegum.