Imagine your OTP being able to have superpowers. Like here's my imagination.
Person A and Person B are on the different sides of the super hero war but they are secretly in love. Everyone thinks of them as enemies but there actually secretly meeting each other.
That had nothing to do with superpowers. If you use the prompt, one side of the war uses water powers, the other is fire. The water side also has the power of Earth, like any resource on Earth, and the Fire side has the air or wind powers.