With my Oscar Rat stories, I have a virtual menagerie. So many that to keep them organized I store them in a fictional apartment house on a back street of my mind. Oscar has at least a couple-hundred stories using mostly the same characters.
A good character often gets its own series of stories. I find knowing all of them well from previous uses makes it easy to pick and choose characteristics.
Many are fully developed, having their own unique traits. Oscar Rat himself, for example, is married to a skunk named Malodor. She’s a typical housewife type, spending her time trying to keep him out of trouble as well as take care of their daughter, Nancy. Nancy is a teenager with all those teenage angst problems. Nancy has a boyfriend, Andy Aardvark ... and so on.
Oscar works at two jobs. He’s a staff writer, ala Winston Smith, at the Rat Archives, rewriting Rat history. He also works as Rodent Advisor and Troubleshooter to President Obama. That job sends him around the world and gets him into trouble.
Other residents of that apartment house are the same, developed over several stories each.
Other characters, such as my Private Eye, Sam Musscosolvo, are developed over the years and used often in both their own series and along with other recurring characters.
I write an Alice in Wonderland knockoff series, using many of the apartment house characters.
In general, I find that recurring characters are easier to use than dreaming up the attributes of new ones for every story. I already know how they’ll act and react to various problems.
Charlie