User blog comment:Flamesword300/Overlooked? Ichigos true strength/zanpakuto discussion/@comment-4207271-20130619035735

Maybe his Zanpakuto is not a melee type, but a different type? Could be possible since Qichigo was holding back is Zanpakuto, Hichigo, Ichigo could in fact have heaps of unrelated abilities.

I personally think it has the potential to be a Water-Type simply through foreshadowing and the name (Slaying MOON).

Kaien Shiba looking near identical to him (Water User) Yhwangetsu hating the rain, as it might represent the opposite of his powers (Credit to Texasheat0384 for this point) The Moon is often associated with water There are a couple more points I had thought of, but can't remember them right now :)

And before people bring up Engetsu's Flame-like abilities, it was never stated to be anything, just hinted at. Hell, it could be isolating and burning Hydrogen Gas or something similar.