Wheelchair Halloween Costumes

Thought I would post a couple of pics of my son Harry who is in an electric wheelchair. It is always challenging to come up with something that is unique and also warm enough as we live in BC, Canada and we can easily be -10 during Halloween. 1st one is using the gun to put the sweets down into a bag that is on the inside.  2nd one being our hallowed game Hockey, where the  net is attached to the back of the chair. Got any ideas for this year? I am out of ideas!!!

Cheers in advance.