The overall look of it.

The layering and the colors look pretty rad ^^

The use of differant items and layering.

The covered lower half of the face.

The no eyes.

Double Halo OMG

I dunno about unique, but the sword with the whole outfit is pretty cool. . .

The use of the Seabreeze headband thing.

The antler-hat combo

Multi-colored eyes imo.

Probably how he looks so evil yet not really menacing. XD

The bleeding eye O.O

Had blue eye shadow,

The curling demonic tails.

The punches of red throughout the avi.