Okay first off all I need to get head shots of this guy because these photos do not do any justice to the details of those antlers and that face whatsoever like dang.
A deer species of my own, a bit of red elk and a bit of reindeer went into this design. He's a spirit of winter and a congerer of ice, though he has to be wary of using his magic as it pulls power from is his own life force and he risks his body melting, as evident here in the slight melt of his face along his beard.
This costume features hooves and antler tips from DVC, the rest of the work and the design is my own
PS there is a huge irony debuting an ice creature during a 100 degree heatwave.