He is a hero of another story.
> In works of fiction, it often seems like the world revolves around the Main Characters, that nothing interesting happens unless one of them is in the middle of it. And sometimes that’s true; sometimes the main cast are so important that nothing big can happen without their involvement. But other times, it’s not that the Main Characters are the only ones that stories happen to; it’s that we only see the stories that happen to the Main Characters. It turns out the supporting characters have their own adventures going on off-screen, where they’re the stars and the Main Characters only make cameo appearances. These characters are the Heroes of Another Story: we may not see much of their adventures, but it adds something to the fictional world if we know these people continue to lead interesting lives even when the Main Characters aren’t around.