Below is the color cover for chapter 31 of Youkai Shoujo - Monsuga.
The characters here are very clearly cosplaying as characters from other works; which characters are they cosplaying as?
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The child in bird (kiwi) costume looks like Diao He Liao (Karyou Ten) from Kingdom.
Unfortunately, I do not recognize the child in what appears to be a kiwi costume, but here's a list of all the other characters.
From front to back (closest to farthest):
Unknown kiwi child...
On screen in the background:
Kappa as him-/herself.