The banner shows either an image of a champion that the player has defeated, or the number of champions that the player has defeated in roman numerals. The banner carrier's examine text changes depending on what banner he is wielding. Players may change the banner displayed simply by talking to him. It is important to note that even though banner carriers are pets, they do not appear on the Familiar tab and Interact is not possible via Familiar Options. As such, players can only interact with them by clicking on the carrier if Hide familiar options is unchecked.
If the player calls the banner carrier, a leprechaun's face appears on the banner for a split second. This is probably a glitch.
There was a bug where if the player faced the Grand Exchange booth and summoned the imp, he would appear inside the booth with the bankers and Grand Exchange clerks. He could not move unless the player moved away far enough so that he would reappear next to the player. This has been fixed.
When the player asks the banner carrier whether he is getting tired of carrying a banner around, the banner carrier tells the player that another imp replaces him when he's tired, and that the player didn't notice the last time he got replaced.
Snow imps had the same chathead as the banner carriers (in different colours), but theirs was updated with the 2009 Christmas Event. The banner carriers still have the old chathead.