Wanderer is a very deep character of the universe of Genshin Impact. However, a few months ago, in one of his travels, he fell into a portal that left him in another universe, the one of Mario Galaxy. He came to explore the comet/ship of the leader Rosaline, and travel through some galaxies to adapt himself to the new world. Rosaline give him the charge of 'Guardian of the Stars', and let him stay in her ship.