Tchallichammi is a 19-year-old male member of the Royal Space Force Headquarters in the Kingdom of Honneamise, serving as a friend and colleague to protagonist Shirotsugh Lhadatt. He possesses fair skin, dark black hair, and grey eyes, standing 1.60 meters tall and weighing 65 kilograms. His personality frequently displays boredom and apathy, with little indication of active participation in significant Space Force duties. Though he socializes with peers during group activities like late-night gatherings, he often appears disengaged. Tchallichammi exhibits a known sarcastic streak and prefers solitary time with his cat, revealing a distinct fondness for felines.

He first appears alongside Shirotsugh and other friends at the Honneamise Cafe, establishing early camaraderie. Tchallichammi later participates in the Space Force Conference, though his specific contributions or dialogue remain undetailed. He shares living quarters with fellow cadets and is present in scenes depicting the group’s routine interactions and collective downtime.