Inconvenient Power House
Characters that have great power, and could kick a lot of people's assess, but their powers are awkward, inconvenient or uncontrollable.
Wether because they don't have much control over their power, aren't aware of the potential they have, to execute their attack takes too much time and preparation, or because it has some kind of negative side effect, these wallop-packing characters only save their true strength as a last resort.
They are usually glass cannon, either weak minds, weak wills or weak bodies.
Jean, Wanda, Sue, all of them had these amazing powers that they had hidden, we just need to have Wasp to be actually a super souped up lady instead of having the power to become WEAKER and every Marvel 1st gen female will follow the same path.