Id like to look similarly to Lord Necrosius here: Except i love helmets so Mark of the fly helmet on him and the Force Staff would be more akin to an actual staff than a spear. Then i shall spread the bountiful gifts as a Nurgle Sorc all across Arkhona!
Me, duel wielding chainswords, a jet pack, with chainsword parts sticking out of it, so when I land on people, they are shredded to pieces, my boots are plasma infused, so when I kick something it has the same effect as a point blank plasma cannon shot.
If not a chaplain... Its got to be a vanguard marine with an eviscerator. God please let eviscerators be in the game. I want to be able to dive head first into the biggest/strongest horde of heretics or xenos and fling that two handed god sword like I was trying to swat a fly.
malal? iron warriors dont worship malal--in fact they would probably kill you if you did. but whatever.
adamantine mantle would not be available to a 'mere' sword brethren. me? oh. i have two top ones--but quite a few overall. Black Templar Master of Sanctity Chaplain (Valerius) with terminator armor, Combi heavy flamer/meltagun(or multi melta), for CLEANSING FLAME, holy hand grenades of antioch, nades of all kinds, rosarious obviously, adamantine mantle, and plenty of relics and servitors to carry them. the other...? the exact opposite. Word Bearer Dark Apostle (Corphax) with artificer armor, daemonic wings, nades of all kinds, an accursed crozius with a bound bloodthirster inside...or perhaps a SUPER RARE UNDIVIDED GREATER DAEMON if that ever is a thing..(seriously that should be a thing...), very powerful psyker, chaos rosarius equivilant, daemonic stature so he is as big as a terminator, and a storm shield divided into five sections--each section has a different mark of chaos, with the circle of undivided centered around the Word Bearer symbol. Later...he would be a mighty daemon prince. But only when he achieved the mark of chaos ascendant. Haven't decided specifics of what he would look like, but he would still have a massive accursed crozius, and wings.