Ah, a gravity master who can do more than simply zero it out. A sort of mass shadow projector, from they way it's described. Nice, interesting, and versatile power set, useful in a few dozen situations, including not only combat, but rescue as well. She could do well with any team, though given she wouldn't be bullet proof without some serious armor, I'd say she should keep to support fire. Again, there's a reason Superman and Wonderwoman frontline for the Justice League 9 times out of 10 when going into combat directly, while Batman runs support.

All in all, sounds like a decent setup for a character in the MHA universe, and some nice design stuff too. Always love little detailing on the suit. Can she extend out the tail? That alone would be a decent utility and combat tool for her, allowing her to lighten her own gravity and fling it outside her effect to provide momentum in a certain direction, or even as a combat tool to use it to pull herself quickly around the battlefield.