@JbcoolI only recently learned that the White Scars were all basically speedfreaks and mongols in space xD
As for the Ork, Toof's melee weapons. Well,
aside from the fact he's a big nob in mechanized armor that could probably bench press a car; no, he doesn't have any melee weapons. The closest thing he has to a close-quarter weapon is his twin-linked flamers.
Granted, in theory, if you apply enuff dakka, you won't need melee weapons as nobody's gonna get close enough to you anyway without being turned into extra-airy swiss cheese ^^