Challenge 1 Hello from the side line

Write a life history/ background / descriptive scene starring a favorite side character from another writer's story or media series or your upcoming #CampNaNo.

This can be anything about anyone, a day in the life slice that you can imagine, childhood event, or random interaction.
I know there have been side characters that I have found intriguing. I wished they had more page or screen time. I even have liked some side characters more than the MCs in many cases. They just seem to have something about them.