Jason D (Buffy the Vampire Slayer)

Jason is a powerful mage, warrior, and writer who teaches Willow magic until they turn 20, when she sets off on her own path of magical discovery. In some universes, he and Willow and lovers who marry at the same age of 28. In others, Willow and Jason are simply the very best of friends.

With Willow

 * The Beginner's Guide to Magical Theory and Practice (2019)

Solo

 * Everything You Need To Know About The School of Illusion (2020)