"Yes, Makima is canonically Japanese, as the Japanese government raised and used her as a weapon since her rebirth, and her history and appearance (such as her name written in Japanese) firmly place her within the Japanese context of the Chainsaw Man storyline. Although she is a demon, her human identity and her relationship with the world develop in Japan, where she is the leader of Public Security Division 4.
Evidence of her Japanese origin:
Government Raising: She was used by the Japanese government as a weapon, devoid of emotions and created for its own purposes, an experience that profoundly shaped her.
Name: Her name, Makima (マキマ), is written in katakana, a Japanese syllabary, and while it may contain puns, it is rooted in the Japanese language.
Plot Context: She operates within the Japanese Demon Hunter organization, interacting with Japanese figures such as the Prime Minister and Kishibe. In summary, although his nature is demonic, his incarnation and main role are linked to Japan, confirming that he is a Japanese character in the Chainsaw Man universe." There are no excuses.