Gavriel Loken (how in the name of Him-on-Earth was that name still available?!?) is a fallen captain...muahahah. If that's not perverse.... Alloken (somewhat less surprising that that name wasn't taken) is fittingly a master of relics, or whatever. Irillyth (ok, forgeworld, so I guess it's not too crazy that I could land a phoenix lord) is a yet-unkitted eldar. Shadeweaver is a Legionaire. Obviously, the names of legionaires aren't known/used, so I can throw something cool in there without busting fluff.
Veteran Sergeant Damon Torvanus, ready to lead my fellow Ultramarines into battle. (secondary) Jaggrim Fellmaw of the Space Wolves.
Nasher Quilen, Ultramarine devastator, ready to replace body parts and join the Iron Hands if they ever become available.
Shakius Ultramarine Apothecary "Yours is to serve, unto the last drop of your blood, that your brothers might live to fight on. Watch over them, heal them, offer up your very life should it extend theirs but a moment, and by your sacrifice the enemy be slain. And when the time comes that you must fulfill your most solemn oath, speak clearly, speak proudly, speed the bolt that brings his end and send him joyous to the Emperor’s side. Then do your duty, take that which is due, and know your mission is done."