[@JackDLemmy] Alright. From what I get from the fruit is that it's similar to Kidd's, but instead of manipulating electromagnetism, it's more of the concept of magnetism. The idea in itself is fine for now.

The nerfs and conditions I was previously taking about would involve it's area of effect (AoE) and on how it's activated.

For it's AoE, I'll limit it to single objects. So basic hand held weapons, cannon balls, then large rocks at most. Charging up an average sized person would be difficult and take a significant amount of time. The stronger you get, the larger the objects it can affect. Eventually you'd get to charge up larger areas such as land.

The conditions I was talking about would be how you would trigger the charge. You'd require physical touch. At present, it would definitely limit what you can do, but that's the point.

A good reference point would be Shiki and his Levitation Fruit. It's very similar to what you want. However, instead of electromagnetism with pushing/pulling, it's just manipulating the things he levitates. The area he effects is incredibly massive, affecting entire islands.

Anyway, that's about it. Physical contact let's you assign a neutral charge. No technique needed. Changing it either positive or negative requires techniques.

Also, what do you mean regarding your mentions on kinetic energy?