Scarlet Heroes (DriveThru Link) is an OSR style fantasy RPG designed for use by a GM running a session with only one player.
It uses the same stats as most OSR/D&D games, but the rules are modified so that a single player is still able to survive adventures designed for full parties.
The free Quickstart version of Scarlet Heroes is available here.
I couldn’t find a separate downloadable character sheet for Scarlet Heroes, so I pulled out the one from the PDF and made it fillable. I also made one for the quickstart version.
I’ve also added this to the ever-expanding list of character sheets I’ve made.