Well, I tried to make these two twins, but I didn't get a really identical thing going...
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Alice and Kathleen Hooper are identical twins with opposing powers. Alice generates ice and Kathleen does fire, they have tried to make plays with this, like "The Thermostat Twins" but no one else ever finds it funny. They work with each other to the extent they can with fire and ice-based powers respectively. They are rarely too far apart, though they dislike dressing in the same color. The two are close to a degree thats hard to get across. They finish each others sentences an unusual amount of the time and sometimes will even say some truly strange things like they consider the other to be their other body or something. They also seem to often know what the other knows in spite of a lack of communication opening. These strange mannerisms and ways of speaking have lead some people to speculate that these two are actually not twins at all. The wild conspiracy theory states that they are actually the same person split into two bodies, one mind with two perspectives. But, even in a world of people doing the impossible, that's probably just silly.