I vaguely remember these ones! I really should reread one piece at some point.

Miss Gravity Powers and Mr. Explosive Boogers if I remember correctly.

"Gravity" is drastically over-stating her power, she can just change her weight. If she had explored her power in the slightest, she might learn to change the weight of anything she touches; if she really had "gravity powers", she could generate her own gravity well and pull objects of immense size (apart of Blackbeard's power, in fact) or simulate fishman karate moves by pooling fluids around her hand, for instance.

She indeed have weight power. The one with Gravity Power appear much later and can casually drop meteors on his enemies.

There IS a person with outright gravity powers who does show up. Won't say how or who, but they do appear.

Odd... if I remember correctly, seeing something 1,000 feet away should give a -100 penalty on their Spot checks