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Species: Halovian

Homeworld: Penacony

Affiliation: Former head of the Oak Family; Astral Express passenger

Playable Path: Harmony

Family: Robin, his younger twin sister

Appearance: Sunday is an elegant Halovian man with fair skin, golden eyes, and silver-white hair styled to frame his face. Small feathered wings extend from the sides of his head, accompanied by an ornate golden halo-like ornament. His refined clothing combines white, black, navy, and gold with intricate celestial and avian motifs, reflecting his aristocratic upbringing and association with Penacony.

Background: Once a prominent authority in Penacony, Sunday pursued a utopian vision through the power of Order, hoping to eliminate suffering by creating a controlled dream-world. His defeat forced him to confront the moral consequences of imposing happiness upon others. He subsequently embarked on a new journey aboard the Astral Express, seeking to understand the universe beyond his former ideals.

His younger twin sister, Robin, remains central to his life. Their shared love and contrasting philosophies profoundly shaped his worldview.