Chapters like the black templars in terms of fighting style, but preferably without the disdain for psychers and mutants that are still human.
>>54185360
Make your own chapter
It's the ENTIRE point of this whole game
>>54185360
Carcharodons, maybe? Always on the offensive, roaming space, melee focused. Very different flavour to the whole crusading knights thing, though.
>>54185388 is the best suggestion, though rules wise you're not going to be able to pinch the BT exclusive units. I'd also try and make them more distinctive than "like the Black Templars, but I still want to use psykers."
Imperial Fists?