These guys appear in the "Gashapon" episode of my webcomicwww.webtoons.com/en/challenge/…
I originally made these as a parody, long time ago, The figures were inspired by mixing Devilman-Silene and Jon Talbain/Gallon (from Darkstalkers), and one of the color schemes resembles Jedah's (also from Darkstalkers, which in turn is also a tribute to Devilman, whew!).
Eventually I decided to throw them into the comic as some sort of tribute/fusion of the many things I love.
The main character is a fan of these fictional series (trope: Show Within a Show), which can be seen as he wears the character's emblem in his shirt, plays the mobile game, and gets one figurine from the vending machines.
Chamuko comes from "Chamuco", which is Mexican Spanish slang for "devil". You can use Japanese phonetics to pronounce this word.