Aardvark Anatomy – The character has the form and/or characteristics of an aardvark.
From an in-fiction POV aardvarks are not particularly strong compared to predators like tigers and wolves. Aardvarks are type of character that are inherently exotic. This can be either a strength or weakness from a narrative perspective.
Cerebus the Aardvark is the most famous aardvark hero and come to think about the only aardvark hero and dies in Cerebus #200. Cerebus the Lion or Tiger or would not have been as inherently ironic as choosing an exotic animal such as an aardvark. Cerebrus challenges the fourth wall via exotic characterization.
Gumshoe is Commissioner James Gordon pet aardvark (Capstone’s DC Super-Pets Character Encyclopedia). Gordon is a relatively rounded character. Gordon is not just human but an older human who smokes and is past his prime. An off-beat pet makes more sense for an off-beat hero like Gordon than a flat character like Superman who has a more “normal” pet like a dog. Aardvarks eat termites! Explaining how Gordon feeds termites to Gumshoe could provide a comic effect to a narrative about Gordon.