I would need to think up a shikai first. All I've come up with is for a never-created Bleach RP character, an albino guy who's zanpakuto turns into a weighted umbrella club and concealed dagger in awakened form. I'm still trying to come up with a bankai form that's not all that close to Kaname Tousen's.
As for myself...not a friggin' clue. Which isn't a problem, since I can't draw anyway. Since I'm still pining for fist weapons in WoW to get a little love, pretend I came up with a sword who's shikai form is a pair of bracers and punch-daggers that I can use to screw with peoples' emotions. Bankai might be armored sleeves and brass knuckles, with the accompanying effect being something along the lines of a Nasuverse Reality Marble that allows me to dilate time.
Frankly, I'd probably be better at kido than melee combat, anyway.