Dendritic Cell is an immune cell whose primary function is to act as the body's information hub, responsible for activating other immune cells by presenting them with crucial data about invading pathogens. In the world of the anime, he is depicted as a young adult male with a calm and gentle demeanor, often seen standing studiously at his post within a large, symbolic tree. His standard appearance features a formal, dark green uniform consisting of a peaked cap with a small branch sprouting from it, a matching suit jacket, slacks, black shoes, a white polo shirt, and a black tie. This clean, orderly look reflects his methodical and patient nature.

Despite his typical politeness and mild-mannered personality, Dendritic Cell possesses a mischievous and playful side that becomes evident in his unique methods of communication. He has a notable hobby of collecting embarrassing photographs depicting the past failures and awkward moments of fellow immune cells, particularly the T cells. In the series, the biological concept of cytokines, which are signaling proteins that activate immune responses, is creatively personified through these photographs. When he needs to motivate a hesitant cell or rally the immune system, he spreads these "cytokine photos," guilting or inspiring other cells into action in a way that he finds genuinely good fun. This trait showcases his clever and somewhat sneaky approach to his duties, always with an enigmatic smile that hints at the secrets he holds.

Dendritic Cell's core responsibility in the story is as an antigen-presenting cell, a critical bridge between the innate and adaptive immune systems. He gathers fragments of defeated bacteria and viruses, known as antigens, from other cells like the Macrophage. He then presents this information to naive T cells, effectively activating them and guiding their transformation into powerful effector T cells ready for combat. This mentorship role places him as a key figure in the development of other immune cells, as he patiently oversees their progress and provides the necessary push to overcome their fears or hesitation. His key relationships are therefore with the Macrophage, from whom he receives information, and with various T cells, including the Helper T Cell and the Killer T Cell, whom he educates and activates.

A notable aspect of Dendritic Cell's character development is his dramatic transformation when exposed to polysaccharides derived from Lactic Acid Bacteria. Upon absorbing these substances, his normally reserved personality shifts to become wildly energetic and extroverted. In this state, his appearance changes drastically: flowers bloom on the branch of his cap, he wears flashy pink-rimmed sunglasses, black gloves, and a flamboyant dark green coat with gold trim, and he may even carry a whip. In this energized form, he becomes a spectacle, liberally scattering his collection of embarrassing photos across the battlefield to create a commotion that forces the entire immune system into a state of high alert and hyperactivity. This transformation highlights his otherwise hidden potential for showmanship and his deep commitment to defending the body by any means necessary. While other dendritic cell types exist, such as the gentlemanly Langerhans Cell, Dendritic Cell stands out for his central role as the information broker whose unique, gossipy methods are essential for coordinating a successful immune response.