Jou Anno, maternal uncle to Retto Enjō, commands the Saitama Branch HERO Section of the Earth Defense Force, spearheading operations against the Kiseichuu—extraterrestrial parasites that siphon human H-energy. A scientist at his core, he pioneered XERO Gear, combat technology that channels H-energy to enhance fighters at the cost of frequent clothing destruction—a calculated compromise he justifies for operational efficacy.

Long green hair pulled into a ponytail frames his eccentric style: an open white lab coat layered over a black crop vest baring his midsection, paired with snug black shorts and pale green shoes. His flamboyant attire contrasts with a methodical, pragmatic leadership style and scientific rigor.

Jou recruited Retto into HxEros after a Kiseichuu attack traumatized Retto’s childhood friend Kirara Hoshino. Privately attuned to Retto’s lingering guilt, he quietly fosters opportunities for reconciliation between the pair. Beyond mentorship, he navigates team coordination, oversees tech maintenance, and brokers agreements with superiors—notably securing sanctuary for Chacha, a defecting Kiseichuu, to research their biology.

When the Saitama Branch neared dissolution following Governor Mogana Iwatsu’s arrest—exposed as the Kiseichuu Queen—Jou orchestrated countermeasures to preserve the unit, showcasing tactical ingenuity under pressure. Though he jokes about being “an old man,” his hands-on fieldwork defies such claims, blending strategic foresight with relentless energy.

Though his age and personal history remain undisclosed, his interactions balance irreverence and accountability, cementing his dual role as both a mentor and an unorthodox leader within the organization’s structure.