Chalk it up to fun
Recurring characters are fun, for writers as well as readers (I hope). My fictional works have a few recurring characters, at different life stages. Alison from Life Sentences shows up in Stranger Things Happen, as do Kurt and Corinne from Spokesgirl. Heather from Stranger Things Happen is one of the main characters in my latest work, Leaving Disturbia, and she’s about to star in a flash fiction story that will connect her journey. Want a whole pile of overlaps in one place? Then Stranger Things Happen (a collection of 76 flash fiction stories) is the one for you.