Sunday is a refined, highly compassionate, yet deeply controlling character in Honkai: Star Rail. He has an intense need for rules, symmetry, and order. He strongly dislikes uncertainty, preferring to methodically orchestrate everything to avoid the risk of things—or people—going wrong Sunday is controlling and possessive, he’s manipulative and cunning. He is polite, but doesn’t shy away from extreme means. He can be genuinely caring and gentle though.