The Woman Held Together by Gold

Tomoe Kazuma, or as she calls herself, Kintsugi. Aged 21, with a simple and straightforward life largely devoid of overtly defining moments.
Save for one very specific oddity.
In her hands, nothing falls to pieces. A blade is as sharp as it will ever be, the phone screen never cracks, you never need to awkwardly glue a laptop hinge back together. She doesn't really know why. She just knows she can fix things or hold them together, or some combination of the two, just by touching them; everyone around her is blessed for that fact, and they know it.

She puts off a girlish aura, lives as mundane a life as she can, and tries to keep the people she cares about in one piece even if it means sacrificing her own happiness.

... But that's only half of the story. The rest is a woman prone to unhealthy obsessions, not the least of which finding something she can't fix; experiencing what it's like for something she cares about to actually break for good, that sensation of genuine loss. She's a thrillseeker pushing herself further and further with no regard for burning out or fading away.