Chainsword with bolt pistol when melee fighting
bolter when range fighting

Umm ... Giggety ?

I can't decide on a single Legion or Warband, but my top choices are Iron Warriors, Crimson Slaughter and The Pyre (orange armor FTW).

For weapons, I'd be carrying a meltagun, a bolt pistol and a chainaxe or powerfist, with ammo and grenades according to the expected situation and enemy.

My power armor would have some organic looking, like heavily mutated by the Warp. My helmet, the face I present to my enemies, would resemble some kind of howling daemonic creature with an upper jaw full of teeth and 6 eyes. I would also add some talons to my boots, for extra killi-grip.

power fist for smashin
plasma pistol for shootin

As a Night Lord, I'll still a stalker bolter from a dead Alpha Legionnaire. You will never see me!

Reaper autocannon and a lightning claw!

Bolt pistol and knife. Anything else is just showboating.

As an iron warrior - The Autocannon

End

Of

Story.

Can't wait to get my hands on one.

Gorechild and a plasma pistol

The Plasma seals the wound and stops the bleeding, dammit! Why Kharn, why!?