Reaper Bird, known in battle as , (a single comma symbol) before its spare conditions are met, is an Amalgamate found in the True Lab, where it is disguised as an exclamation bubble that appears after gazing into a mirror. It is composed of parts from Astigmatism, Final Froggit, and Whimsalot. Its body is so long that about a third of it covers the dialogue box, which it retracts when attacking.

Reaper Bird's head is made up of the body of Astigmatism, with Astigmatism's "legs" serving as Reaper Bird's beak. The small white areas at the top and bottom of its eye (which would typically be the sclera of a real eye) are repurposed as gnashing teeth which occasionally close over the pupil.

Reaper Bird's wings are made from Final Froggit's legs while its own legs are unnaturally-extended versions of Whimsalot's legs.