Many years ago a young red squirrel in need of a change applied for something called a "mascot", the only qualification was the applicate had to be Terran. Now many years later Commissar Dodger leads Guardsmen in battle, purging heretics and xenos in the name of the Emperor, he's earned the rank of Commissar and the title "Adeptus Sciuridae"
This possible act of heretical Fanart created by RaccoonRanch https://inkbunny.net/RaccoonRanch (Though still less heretical than some of the Black Library's entry's or the Codex Custodes update.)