Welt Yang, real name Joachim Nokianvirtanen, is a character from the Honkai video game series developed by miHoYo. The character first appeared in version 2.9 of Honkai Impact 3rd in 2019, where he serves as the leader of an anti-cataclysmic organization known as Anti-Entropy. The character also appears as one of the main characters in Honkai: Star Rail, in which he is a member of the fictional organization known as the Astral Express crew.