This looks interesting! Thinking about ways to make a size manipulator interesting to play. My first thought was tying it to perspective a la superliminal, but this sounds messy to write. I just go with the classic 'can also manipulate their mass'.

The other big question is 'born with the power' or 'science'


Edit: Looking at everyone's character sheets, I've grown fond of the idea of my character being one of the other kids on the government supersoldier program that created Abby. My character accidentally growing way bigger than intended during a test, and wrecking the building, might even be what resulted in Abby and several others being able to escape.