Marker is a character from the anime Papuwa who serves as a member of the Ganma Army's Special Battle Unit, specifically under Harlem's command. He is of Chinese origin and is distinguished by his calm and composed demeanor, rarely showing agitation or excitement. Marker is highly skilled in swordsmanship and possesses the ability to manipulate fire, which he channels through his signature attack known as Flame Serpent or Flame Dragon, unleashing a scorching blast in the form of a snake. Additionally, he is proficient with acupuncture needles, using them with precision in combat.

In the story, Marker plays a supporting role and is most notable for his past as the former teacher of the character Arashiyama. During his time as Arashiyama's instructor, Marker instilled in him the belief that he is the best and that everyone else is worthless. This lesson became a deeply ingrained default mindset for Arashiyama, ultimately becoming the reason he struggles to form friendships with others. Marker's influence on Arashiyama is a key aspect of his character, shaping the younger warrior's attitudes and social interactions.

Marker's motivations are tied to his loyalty to the Special Battle Unit and his duties within the Ganma Army. His relationships are primarily defined by his professional role, particularly his bond with Harlem as a subordinate and his former mentorship of Arashiyama. Development for Marker is limited, as he remains a relatively static figure focused on his combat skills and his unit's objectives. His notable abilities include advanced fire manipulation, expert swordsmanship, and the rare use of acupuncture needles in battle, making him a versatile and dangerous opponent.