To Stand in the Light by Kayla Bashe

Answering a distress call in the farthest reaches of the galaxy, teenage half-demon Shadow finds a scene of carnage where their superheroine foster parents once lived. Only one thing holds them back from seeking death: the unexpected discovery of a small, scruffy girl. Bean, an acid-green-haired high school dropout, is feral and whimsical by turns. As they travel home, she slowly grows to trust Shadow, and wriggles into their closed-off heart.

Dangerous secrets and painful memories drive Shadow away from New York again and again, but their friendship with Bean only grows. When they return home, though, it’s to a grown-up Bean who finds herself falling for her former mentor — and tumbling headlong into much bigger trouble than anyone suspects…