Which seemingly normal ability is actually more powerful than the ability name suggests?

[Mariogoods]

For example, Reimu's "ability of float".

While flight is widespread among inhabitants of Gensokyo, Reimu's ability extends beyond that, encompassing not only more complex techniques but her behavior in life. She merely casually floats through life and is so in touch with her surroundings that she has been likened to a hermit. As long as she "goes with the flow," she showcases both incredible intuition and luck, though she loses her edge when she is distracted or acting on selfish desires. She has been observed to dodge attacks as if she were made of air, while, from her perspective, the projectile swerved away from her, and she has walked across a river unknowingly without getting wet by stepping on fish as they leaped from the water. More notably, it allows her to accomplish things such as circling an enemy by moving in a straight line, appearing from the least probable places with no real reason, on top of teleporting short distances.

And Electricity Manipulation in Twin Peaks. You can check the page.