character concept: person who is born on Leap Day, but rather than only becoming a year older on exactly their birthday, they age as normal, and an additional four years every Feb 29th. See, the _idea_ was that Mom would have the kid on Leap Day so they'd have four times the lifetime, which didn't really work for the expected reason, but Father Time already _has_ a way around that, so now, the kid ages 7 years for every 4, in big, inconvenient 4 year spurts.

And now they owe some years back.