There's an old saying in writing. "Write what you know." In my case, I know about the people I've been in contact with over the years. My interests, my friends' interests, anecdotes from real life, and any other ideas that pop in my head have been used to create these works of fan-fiction. Maybe one of these days I'll create something truly original.
Star Trek/USS Baldwin
Based on Star Trek, created by Gene Roddenberry.
While this is technically "fan-fiction," because it is set in the universe of Star Trek, and there are appearances from established characters, this series of stories revolves around a group of original characters. The first story takes place near the end of 5th season of Star Trek: Deep Space Nine.
Based on NCIS, Created by Donald Bellisario and Don McGill.
These stories put a slightly different spin on the characters of NCIS. The first story takes place between the second and third episodes of the 10th Season.