[quote=mattmanganon]
But the point was that there is no canon personality beyond "Grrr, I'm a big bearded space marine! RUSS AND WOLVES FOREVER!!!" If it has to be canon then i'll come up with something else. Games Workshop never give their characters personality, just cool shit to do. Canonically, there is only a handful of Warhammer 40,000 characters that have an actual personality, rather than just a laundry list of cool shit they have done, and only a few come to mind, like Caiaphas Kain and Gunner Jurgen.
[/quote]

So pick a character from the Black Library and run with that then.