Aizetsu

He is portrayed as constantly dejected and pessimistic, viewing everything in a bleak light. Furthermore, he is described as a reclusive and reserved individual, who prefers to operate alone and does not seek emotional connections with others. In terms of personality, Aizetsu exhibits traits of an ISTP type. This manifests in his independence, practicality, adaptability, and willingness to take risks. Although a loner, he also displays a certain adaptability in shapeshifting and overcoming obstacles, and enjoys the thrill of battle. However, he is also fiercely independent and dislikes being controlled or ordered around. Despite his depressive nature, Aizetsu is shown to be a clone who cooperates with the other Hantengu clones and follows Sekido's orders without complaint. Although Sekido finds him frustrating, Aizetsu remains loyal and cooperative, though his depressive disposition is affected when he is forced to fuse with Sekido, displaying a desperate and pleading side.

Aizetsu also resembles Sekido and Karaku, with the only difference being that his tongue has the kanji for "sadness" and he always looks dejected. He is the manifestation of all that is painful and the only one who acts only after meticulous planning. He is the calmest and most negative of all emotions. He wears a black kimono with tightly placed, intertwined white lines. He also wears two rope-like ornaments tied to his shoulders. He also wears hakama pants and a pair of zori. He always carries a Jumonji Yari with him. He is characterized by deep sadness and negativity.