WMG / Le Donjon de Naheulbeuk

The Thief, The Minstrel and The Paladin were the same person.

Kinda. There's a theory about the whole story being actually a Tabletop RPG party, explaining why the characters have no name, talk about their XP or fate points, break the fourth wall often, and the narration mention rolling dices. In that case, the same player was certainly behind the three characters; being unlucky enough to have his/her Thief killed, he or she made the Minstrel to go on playing, (he was encountered soon after the Thief's death), and did it again with the Paladin after loosing the Minstrel. However, as the Paladin did not die but quit, you can imagine the player finally left the game for reasons tied to Real Life.