Here's a redesign/reimagining of Big Chill. Not really too different from the original, but i think it's an improvement.
As this version his ghost powers are gone and he has flight and the ability to freeze stuff by absorbing the heat around it.
As for his costume I decided to put white on it to make more like an OS costume and I put more black and gray into it because this version is the go to alien for stealth. I got rid of his antannaes because they looked a little to silly to me and replaced it with a hood thats sort of like a skin flap that can go around his neck or stretch into the hood seen on the one at the bottom.