Chiu appears as a minor protagonist, a rodent-like monster character physically depicted as small and rotund, resembling a rat. This design grants him a distinct visual identity. His background establishes him as a former student of Brokeena, the legendary God of Martial Arts, where he trained alongside Maam at the Romos dojo.

His narrative arc charts a path of martial arts progression. Initially struggling under Brokeena's instruction, Chiu demonstrated perseverance. He eventually mastered significant techniques, achieving proficiency in the specialized Refractor Fist – a martial art that disrupts an opponent's regenerative capabilities by overloading their healing processes. He attained mastery of this skill earlier than Maam on her parallel martial path.

Chiu actively participated in the broader conflict against the Dark Army. Fighting alongside the Disciples of Avan, he operated under the identity "Beast" as one of the controlled combatants within his own Beast Soldier system during critical engagements. His role consistently involved direct combat support utilizing his refined martial abilities.

Following narrative developments involving Hyunckel and Hym, Chiu inherited command over Hym. This established a lasting partnership where Hym became integrated into Chiu's group of Beast Soldiers, functioning under his direction within the allied forces' structure.

Throughout his arc, Chiu maintained a trajectory focused on martial arts growth and combat support. His narrative presence is defined by his background under Brokeena, mastery of advanced techniques like the Refractor Fist, active participation in pivotal conflicts, and eventual leadership role over Hym as part of his Beast Soldiers.