Is this functionally different enough from center of gravity manipulation?

[i]"Ai's Semblance allows her to apply her aura to change her physical weight at will -- from as light as a baby to as heavy as a car. She uses this to her advantage by altering her weight while grappling with the Tiger Teeth to weigh herself down and pull heavy objects, or make herself light enough to swing around objects. Ai's own physical hardiness is directly tied to her weight: at her lightest, Ai is using the least amount of aura, and takes the most damage."[/i]