So, that all looks good except the Feat: Unreasonable Athleticism. Basically, I'd like to ask a couple of questions about that
If she uses a Gravity Field to throw something heavy, what happens when it exits that bubble and it regains its original Mass?
I think that perhaps "reflexively" adding weight to increase its accuracy is a touch too much...I have no issue her being able to do that, but I think it needs to be specified at what range that ability becomes ineffective...so how far does it need to go before it loses that weight. Further, maybe have that be something she has to work on specifically, rather than it being instinctive.
Other than that, it looks good on first glance...though it is 3am where I am, so maybe I'll think of something else when I wake up.
OK-- just let me know.
Regarding accuracy: just figured that the focus would just make her seem uncannily accurate when it comes to athletic-type situations. I guess it just makes a fastball move like a curveball... does that make sense? It wouldn't be like a heat-seeking missile.
As far as things entering/exiting the gravity field-- their mass never actually changes, just the measure of gravity on them. So she doesn't have to exert as much force to lift and throw something heavy inside a reduced gravity field, and when it exits it's moving at the speed she was able to exert, so it continues moving at that speed when it exits the field.
This is how I imagined it at various levels: Let's say there's a bank robbery, and its her job to stop the getaway car.
Level 1 (just after powers emerge): She lifts a cinderblock, weighing about 30 lbs... she's waiting out of sight in an alleyway or behind a car, etc., as she focuses her ability. Now, to her the block feels more like 20 lbs, making it easier to manage as a projectile... It's still a heavy object to throw any good distance without hurting oneself, but she's able to take a quick one-two step and hurl it overhand at the waiting getaway car twenty feet away. Wow! It lands like someone threw a fucking cinderblock at a car. It smashes a huge dent in the roof and shatters a window after arcing up and down over a distance of twenty feet. Anyone who saw it would be very surprised that a girl could just throw a cinderblock like that, but it's nothing to call the papers about, and the car is still fully operational. The driver, of course, is going to be less friendly.
Level 2: Same situation: She can emerge from the alley and, tossing the cinderblock back and forth between her hands like it's made of foam rubber, she readies her aim... definitely got this. She takes a running start this time and throws the cinderblock like a softball pitch, whipping it overhead in one hand, then vaulting it forward at about 60 miles per hour. It sinks a little with gravity but it covers the 50 feet to the car in the blink of an eye. The car windows explode from the force, and the car visibly rocks up, almost leaving the ground on one side, before settling back down onto the shattered safety glass and chunks of broken block. The driver is stunned, and has a sprained shoulder because 1) the block caved in the door several inches, and 2) the airbags deployed in his face.
Level 3: Again, same situation. She picks up a cinderblock, shrugs, and tosses it aside... she's already focused her field on this alley, so it hovers in the air. A couple other cinderblocks are starting to float up, and a passing dog in the alleyway notices that his pee is turning into little floating sparkles and drifting into the sky rather than onto the hydrant he was watering. She picks up a pallet of cinderblocks lazily, like she's making her bed in no hurry, and lines them up toward the waiting getaway car. The driver notices cigarettes are floating out of his pack and that he feels rather disoriented, then something blocks the sun and it goes dark-- he looks out the window and sees a pallet of cinderblocks hovering over his hood-- he can't even curse before gravity returns, sparky starts peeing normally again, and the pallet of bricks crushes the engine block of his car as gravity kicks back in.
So if she were to