Welt (or Welt Yang) was the Sovereign of Anti-Entropy back on Earth and former Herrscher of Reason. Due to some circumstances after the defeat of the Honkai, he found himself travelling to another world in order to find the culprits for the events at St. Fontaine, now travelling alongside the Astral Express as a Trailblazer. Welt can be seen as wise and sophisticated, always willing to lend a hand to humanity regardless of his status or the situation.