Just noticed Marvel supervillain M.O.D.O.K. (aka MODOK) with 2 character tags:
m.o.d.o.k. (with 3 posts)
modok (with 3 posts)
(3 tagged with both)

https://en.wikipedia.org/wiki/MODOK
says "MODOK (also written as M.O.D.O.K.; an acronym for Mental/Mobile/Mechanized Organism Designed Only for Killing) ..."

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Most of his comic series have M.O.D.O.K. in title
https://www.comics.org/series/name/m.o.d.o.k/sort/alpha/
"M.O.D.O.K. Assassin",
"M.O.D.O.K.: Head Games", etc

(one exception being https://www.comics.org/series/25785/
"Super-Villain Team-Up / Modok's 11")

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Animated series titled M.O.D.O.K.
https://en.wikipedia.org/wiki/M.O.D.O.K._(TV_series)

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Since "modok" is such a short name, I'm guessing a furry may have "modok" for a character name at some point. (if not already)
(already a FA username of modokmaniac https://www.furaffinity.net/user/modokmaniac ,
EDIT: artwork done for modokmaniac ( https://www.furaffinity.net/view/27342948/ ) is titled "Modok Colored Skech [Comm]",
but turns out that character named Saber https://www.deviantart.com/exdeathyourjudge/gallery?q=saber .
Another upload of Saber character: https://www.deviantart.com/exdeathyourjudge/art/Excited-Bat-Noises-745401345 )

Suggesting character tag be either
a) m.o.d.o.k.
or
b) modok_(marvel)

What character tag would you prefer?