Looking at the source further up, it looks to be a clear helmet with red accent pieces. If you have something to use as a clear helmet for the base, you could maybe manufacture the pieces out of styrene or make them with sculpy or something. The hardest part I can see is the helmet. If you're going to skip it you could manufacture the accents and glue them to the head.
I don't know if you've ever seen the Youtube channel Toy Polloi. He does vintage toy repair and restoration stuff. But I've gotten some customizing ideas from watching him. That guy can make anything with some styrene sheet and glue.