A Day in the Life

By day, Midoriya Izuku is known as Zephyr, a well known quirk analyst, but by night, he becomes Dr. Zephyr, running an underground clinic named Haven's Watch.
In a world where he operates in the shadows, what kind of challenges will he face?
What shenanigan's can he get up to?
What, or Who, will he encounter while keeping his neutral zone, well, neutral?

(Cross-posted on AO3 under commanderstarry)