As a writer, you will spend a lot of time with your characters, so you should really like them. Most stories take multiple rewrites and if you get tired of your characters, so will your readers.
I love Guinness the Therapy Dog and it is fun to write about him during all his adventures. I equally loved each of the fairy princesses in The Fairies of Carlow series and their handsome princes (and one particularly handsome farmer).
I hope you have the chance to read all of The Fairies of Carlow books. I think you will enjoy each of them. Sonja