Neptuneman is a character from the Kinnikuman series who was a masked Kenkaman. This character Kenkaman is based on Hulk Hogan who was actually very popular in Japan as well as the US. In the story, the England native Kenkaman was depressed that he was so powerful and no one could stand up to him in the wrestling world. He felt he had nothing left to accomplish and decided to end his life by jumping into the Thames River.
Upon jumping in, however, he was discovered by the Neptune King, a former battler who had gone to live beneath the waters hundreds of years earlier because he didn't like how the wrestling world had moved away from life or death matches.
Neptune King gave Kenkaman a mask with magnetic powers, changing Kenkaman to Neptuneman!
This M.U.S.C.L.E. character was a favorite of mine when I was a kid. I knew nothing of the Kinnikuman toys back then, and, like most kids, named my little figures however I chose. This guy was named Harvey. Actually they were both called Harvey and formed a tag team together. (He was named Harvey because he looked like a friend of my dad's named Harvey. Harvey drove an El Camino and he was awesome haha)
So I couldn't pass up this giant Harvey figure...
He comes with two different right hands - a clawing, gripping almost-fist and then a fist with index pointer pointing up in a #1 sign.
He also comes with a removable rubber vest with big nasty spikes on the front. the vest is easy to get on and off thanks to a split under the left armpit. so you only have to put one sleeve over his right arm, then the rest falls into place (with a little adjustment to get it under his hair and stuff like that.)
The figure also comes with a long, vinyl cape that has images of all the masks I suppose him and Big the Budo have stolen. In the story, Neptuneman and Big the Budo use their powers of magnetism to go on a mask-stealing crusade through the wrestling ranks. The cape is kind of a pain to attach and is honestly a better accessory to have rather than use.