You don't have to have an OP power, or one that everyone has too. (I've seen so many elemental and physical body changing powers lately). I've seen RPers have powers that are lame at first glance, like the ability to manipulate and create stairs, and to shoot citrus juice from their pores, and they are tough fighters because of how they RP. Thinking outside the box is always a good idea as it helps you have a unique power that helps your character stand alone when people think of a certain power. Make ea silly power and go with it. Plus, remember, not everyone who gets a power could end up with a combat one. They would just have to make it combat oriented by how they use it.