Dust

At the age of 18, Dust was kidnapped by a criminal organization. She is the result of their magical experiment to control the power of an Eldritch Deity. It worked, but at great cost. Dust's identity and memory was erased, and any trace of her former existence vanished. She is unhinged from reality and has a hard time existing in a single location or time at once, or altogether in one piece. 

With enough effort, she can warp and rewrite reality around her, reversing time or distorting space.  Dust now simply watches the world, as one of the most powerful beings to ever exist. She managed to help take apart the criminal organization that created her, and now exists across all of time and space, to make sure what happened to her never happens again. But, she was never able to become one with reality again, or learn who she originally was.

She's in a relationship with Moira Lane, and tries to keep to linear time just for her. She's pansexual, and her favorite music is Speedcore. She once accidentally erased Futurama from existence, and spent a few months trying to bring it back, and accidentally created Family Guy in the process. She does not bleed. Bullets will pass right through her and leave tiny holes. Sometimes her limbs disappear and sometimes she has more than a normal amount. Sometimes there's even more than one Dust at a time.

Whenever she exerts herself there's a chance she'll literally turn inside out into a giant many-limbed demiurge beast and destabilize reality around her. That's why Moira protects her.

In-Game Fighting Style

Dust will probably not do any fighting, but I did make plans for her fighting style if she became a playable character in, say, a sequel. She will primarily be a support character, but all of her abilities grant stacks of Instability. Each turn, she has a 1% chance per stack of instability to "evert" and become a giant eldritch horror, immediately dealing damage and debuffing EVERYONE in a wide area around her. While everted, her new abilities deal lots of damage and inflict debuffs, and consume stacks of instability until she hits 0 and reverts to normal. In her normal form, she focuses more on protecting and buffing allies over debuffing or damaging foes.