As the title says.
I'm not talking about writing an ending for your character when the campaign is over.
Have you ever retired a character and made a new one instead to continue playing?
If so, why?
I've only ever retired a character once, (that I can recall) he fell in love with an NPC and retired from the adventuring life.
I've put this in a DnD thread, but feel free to mention other systems as well.
Yes. In a yearlong campaign, where the DM told us prior to character creation we had to have someone important to us go missing, I created the typical Human Champion Fighter with a background of Outlander. (Two things: We found out it was a cult, and at the time, I do believe there was only the PHB available. No supplemental books had been released yet.) I was a logger, who came home and found my two twin girls gone missing, and my wife dead. Nothing crazy inventive, but the trope worked great for the campaign.
Fast forward to seven months in, and we found one of my girls dead, and the other one alive. Well, I grabbed her, and the other kid who had survived with her, and ended that character. He was a ninth level fighter by that point. He adopted the kid, moved to the countryside, and started logging again - teaching his kids the craft of the trade.
Of course, we still had five months to go and several other character backstories to get through. But there was zero percent chance that character would have risked making his daughter an orphan and possibly exposing her to the cult again. So he retired. To me, it was perfect because it followed the character arc, and not just the campaign arc.
Side Note: I created another fighter who was his logging friend from long ago. A dwarf this time. I chose the fighter again because we had eight players and didn't want to steal anyone else's class-shine.