Mutsu from Kantai Collection depicted as a slug or snail; the association is that the conning towers on Mutsu's headgear resemble a snail's eyestalks. Created by Blew andwhite
The Pixiv tag is り陸奥たか or "rimutsutaka", based on "かたつむり" ("katatsumuri", snail) written backward.
See mutsu_(snail) cameo for a peculiar usage in commissioned bondage pictures.
This tag implicates mutsu_(kancolle) (learn more).