Hachiemon, often called simply Hachi, is a supporting character in Inuyasha. He is a tanuki, a raccoon dog demon, who primarily serves as a friend and servant to the monk Miroku. His full name is Awa no Hachiemon, indicating a connection to the Awa region. In his natural form, he has brown fur covering his body with lighter cream-colored fur on his face, and he typically wears clothing.

In terms of personality, Hachiemon is portrayed as unremarkable and somewhat timid, often preferring to avoid danger and run from fights. His cowardice is a recurring trait, but it does not define his entire character. Despite his reluctance to put himself in harm's way, he maintains a deep and genuine loyalty to Miroku. He understands Miroku very well, and even though he often grumbles and tries to escape perilous situations, he can be counted upon to help when truly necessary.

His primary role in the story is that of a supporting figure and a useful plot device. Serving as a servant to Miroku, he often lives near the temple of Miroku's foster father, Mushin, but typically does not travel with the group full-time. He appears intermittently, frequently summoned by Miroku to provide crucial transportation. Hachiemon possesses the classic tanuki ability to transform, usually by placing a leaf on his head. His most useful transformation for the group is taking the shape of a giant, yellow, gourd-like vessel, which is capable of flight. This allows him to carry the entire group over long distances, transporting them into enemy territory or safely away from danger. Aside from transformation and flight, his basic combat abilities are very low, and he has no weapons. His only other notable talent besides flying is laying down a smoke screen to cover his escape when he flees.

The character's motivations are largely tied to self-preservation and a simple, comfortable existence. He is often reluctant to get involved in the group’s dangerous quest to defeat Naraku, and he sometimes tries to find easy ways to get food or money. On one occasion, the pressure of hunger drove him to impersonate Miroku to sell fake seals, an act that ultimately got the real Miroku into trouble with a weasel demon. However, his actions reveal a deeper layer of loyalty. When Miroku’s Wind Tunnel was damaged and his life was in grave danger, Hachiemon risked his own safety to fetch the others and help save him. Similarly, in a moment of great peril when Miroku was prepared to sacrifice himself, Hachiemon, despite his fear, accepted his master's decision and stayed by his side.

His key relationships are central to his identity. His bond with Miroku is the most significant, defined by a mix of master-servant hierarchy, genuine friendship, and shared history. While Miroku often bullies or threatens Hachiemon to get his way, Hachi also trusts him and follows him even when his actions seem to lead toward death. He is also known to the wider group, including Inuyasha, Kagome, and Sango, whom he regularly ferries around, though he is often too scared to participate directly in their battles.

Over the course of the story, Hachiemon shows a consistent, if minor, pattern of growth. He remains a cowardly figure for the most part, serving as comic relief, but his loyalty deepens through experience. In the sequel series, Yashahime: Princess Half-Demon, his role expands. He is revealed to be the second-in-command of a tanuki clan, the Mamidaira family. Four years after Naraku’s defeat, he helped Miroku and Kagome seal the corrupted Full Moon Raccoon Dog. Most significantly, when Inuyasha and Kagome faced a dire threat from Sesshomaru and Kirinmaru, Kagome entrusted Hachiemon with the most important task of all: taking their infant daughter, Moroha, to safety. He delivered her to the wolf demon tribe, showing that despite his timid nature, he was considered a reliable and trusted figure in a moment of ultimate crisis. This act demonstrates a significant development, revealing a core of dependable courage beneath his fearful exterior.