This time it's the Gate Guardian.
From the preview:
Ho-ho-ho, HeroClix fans!
As our special Christmas Day present to you, we continue our previews for Yu-Gi-Oh! HeroClix: Series One! Today we take a look at a game mechanic in this set that should be somewhat familiar to Yu-Gi-Oh! fans: Fusion! To help us in understanding this trait, we are pleased to present the Gate Guardian!