Some nice Chinese fighting stances would look apprioate for Smoke, since the Lin Keui are Chinese. Don't know too many martial art styles so I wouldn't know what exact stances to give him.

As for weapons katanas and swords have been played out, so should he go this route he should at least have something unusual, like two or a bizarre one. If he's human or made of smoke same asian, blunt, mace/hammer type weapon might be interesting. If he's a cyborg a dual-bladed pulse blade might be interesting.

I just hope he doesn't have any Scorpion's fighting stlyes.

i think his fighting styles will be:

Ninjitsu
Judo
Dual Pulse Blades

I think that Sulsa, the art of concealment, would suit him perfectly as well as the style of Dim Mak (Touch of Death) known as Ghost Hands. As for his weapon, he could have a triple crescent blade type weapon.