Bun dwells as a solitary hermit on a remote alien world, encountered by the protagonist during their quest to locate the legendary Phoenix. A friend of Dr. Saruta, the scientist aiding the protagonist’s mission, he shares his secluded habitat with an array of peculiar extraterrestrial creatures, hinting at a reclusive but resourceful existence.

When the protagonist’s crew flees Earth, they briefly seek refuge on his planet. Bun grants them temporary shelter and cryptic advice before they resume their journey. His role mirrors a recurring archetype in his creator’s works—secondary figures who occupy fleeting yet symbolically potent roles, shaping narratives through subtle influence rather than prolonged presence.