Aahz
Aahz was present in Shelterville alongside Skeeve at the swearing-in ceremony of the interdimensional city's new Justice of the Peace. (COMIC: 24 Hour Comic 2019)
Behind the scenes
Aahz and Skeeve originate in the MythAdventures fantasy series. Jay Epps noted that his rendition of the two for their cameos in 24 Hour Comic 2019 was inspired by the characters' designs in Phil Foglio's comic versions of the series.
Although described as a “demon”, in the context of the MythAdventures series, this does not denote a specific species or faction, but a status: short for “dimensional traveller”, the name “demon” in the series refers to wizards from other dimensions or planes of reality, who can be summoned. In turn human magicians can be summoned to worlds such as Aahz's home plane, where they are considered demons.