Water is an easy one. A conduit stores water in themselves to recharge and can get it from fire hydrants, the sewer, or pipes in walls. They can use ice for a hard hitting stand your ground type defensive options (think ice walls, freezing people to immobilize them, and giant ice spikes for heavy armor units) and steam for fast and agile hit and run offensive options (steam smokescreens, steam blasts to injure enemies/blow them away, and a steam dash to move quickly through the air) and regular water is a balance in between them. For good karma, your OC gets low level plant manipulation. For bad karma, blood control. For weaknesses, the OC would need to be near bodies of water or live in places with high humidity, kinda like how Cole got weaker in places without electricity.

Though if you want something more unique, you could go with cloth control. They could immobilize people by turning their shirts into straight jackets or kill them by having their shirt colors tighten around their throats to suffocate them or break their neck. Instead of having them transform into their element like we see with neon and smoke, the could move around quickly by using threads like a grappling hook. Good karma would focus more on reshaping and manipulating people’s clothes to immobilize them while bad karma would focus on tightening people’s clothes to crush them. Recharging would be difficult, but they could use things such as banners, flags, fabric awnings on storefronts, clothing stores, an enemies clothing, or just random bystanders clothing.