Blobsta

the first one i don't think came from a set, i just want to know how much he could be worth. Photo 2, I can't find the chestplate anywhere! The robot arm on the third photo probably didn't come with that model. The cape in the third photo has some kind of creature's head in the little gold circle. The 5th picture i just want to know whether it is worth anything on it's own. Thanks!

No idea how long i have had it for. there are all of the parts i have in the photos. What is it and how much is it worth?