I think Hydro could work as a cyborg. A cybernetic human that manipulates electricity from his components and flows his electricity through water so its like a combination of electricity and water in one character kind of like rain. Come up with a way to make this unique, like how Kenshi was made differently from Ermac in this game, and we would all see a pretty sweet character. Nightwolf probably wont make it in the next one and Boon doesn't even like Rain so hey you never know. The fact that "Hydro" has been shown at least on those episodes they released and other similar things over the years I wouldn't be surprised if they eventually tried it. I would rather see this over Tremor anyway, because Tremor is really not sweet. However creating an electric rain cloud or a water puddle and throwing some electric current under your foe would be a sweet way to kill your opponent, just sayin.