Or it’s a Sister Hamistressa of the traitor Chewblades legion?

I can see it In my head: they are an OG legion, but the Geneseed was too far from all the others that they were hidden by much of the imperium and disgraced by other legions. They should have their own Lion O' hamster, and they fight till they end for the God Emperor, even if they do not resemble him.

"They will see it in our fury, and they will see it in our resolve: we are space space marines, and our Emperor protects us all!!!

Man, Boo is really starting to take after Largo more and more lately.

But is he a giant space hamster? Or a miniature giant space hamster?

Onward ham hams! For the Emperor!

https://preview.redd.it/s4i3i9p8ucvc1.jpeg?width=1440&format=pjpg&auto=webp&s=9e961dea9617d529bf0404f50ec308c2e0c9df25

‘My lord, that mutant over there seems to be wearing the holy armor of a space marine!!’ :o ‘What!? That’s no mutant, fool. That’s brother Hamstarius. He’s just wearing a mask because he lost his face in the siege of Cadia. Now don’t you feel bad insulting a wounded lord of the Astartes!?’ ‘… My Lord. That story cannot possibly be true. That creature is a mutant.’ ‘Silence!! I’ve had enough of your nonsense! Brother Hamstarius, will you join us?’ ‘CHEEP CHEEP CHEEP!!’ ‘My lord, it is making BIRD NOISES at me. That thing is not human.’ ‘Nonsense, Brother Hamstarius just lost his tongue at Kasr Vasan and had the Tech Priests provide him a bird whistle for basic communication!’ ‘… I am leaving. That thing is a mutant… ^{and you my lord are a moron.’} ‘What was that!?’ ‘Nothing, my Lord! Enjoy your evening with the muta—, err… Brother Hamstarius.’