Sei-Lan is the Guardian of Wind in the Sacred Beast Cosmos, wielding elemental forces to preserve cosmic balance. His role charges him with protecting the Queen and the cosmos, deploying wind-based powers to aid the protagonist in conflicts. He appears as a recruitable character in *Angelique Tenkuu no Requiem*, joining the main party to oppose the invading Emperor Leviath and his knights. His combat abilities revolve around wind manipulation, bolstering the party's strategic capabilities against threats to cosmic order. Personal interactions expose a protective instinct, especially towards vulnerable worlds and individuals harmed by the Emperor's conquests. While developmental arcs in other media remain unspecified, his core function persists as a dedicated Guardian within the Sacred Beast Cosmos framework.