RPGMemes

Record of Lodoss War was created in 1986 by Group SNE as a Dungeons & Dragons "replay" serialized in the Japanese magazine Comptiq from September 1986 to September 1989 issues, though they also used the setting with other systems such as Tunnels & Trolls and RuneQuest.. Many shorter Lodoss scenarios and replays were published in the Comp RPG magazine (initially a supplement of Comptiq) that ran from 1991 to 1994. Replays are not novels, but transcripts of RPG sessions, meant to both hold the interest of readers and convey the events that took place. They have proven to be popular, even to those who do not play role-playing games but are fans of fiction (including fantasy fiction). Similar to light novels, many characters and parties in replays have become popular as characters of anime. An example of such a character is the female elf Deedlit in Record of Lodoss War, who was played by science fiction novelist Hiroshi Yamamoto during the RPG sessions.

Also, obviously, there's the Critical Role franchise that gave us Vox Machina and The Mighty Nein.