1: [Young]
The Mimic has a gimmick: it can masterfully recreate the musical parts of any other Monster that it hears. Well, "masterfully" isn't exactly the word we'd use - especially not when it's still just a hatchling. It's a work in progress, but once the Mimic is a little older and the eggshell has been cast off, watch out…
2: [Adult]
In addition to parroting the music of its fellow Monsters, the full-grown Mimic has another trick up its sleeve - it can shapeshift to disguise itself and take on the form of other beings! Attempts to teach this skill to other Monsters have so far proved unsuccessful.
3: [Prismatic] This Mimic returned from the Prism Gate forever changed! The effects of this transformation at the molecular level have 'frozen' the Air Quint in this form, effectively robbing it of its shapeshifting power. The Monster doesn't seem overly concerned, though: in fact, from its Cold breath, we'd say it's downright chill about it - extraordinary!