Tekkonkinkreet does not depict any identifiable LGBTQ+ characters or themes. The narrative centers on the relationship between two young orphans, Kuro and Shiro, and their fight to protect their city, without exploring aspects of sexual orientation or gender identity.

Tekkonkinkreet does not feature any identifiable transsexual characters or themes. The film's narrative focuses on the bond between two orphaned street kids, Black and White, and their struggle against various factions in the city of Takaramachi, without incorporating transgender identities or related storylines.

The film primarily focuses on its two male protagonists and their conflicts. While there are female characters, none are depicted engaging in or winning close-quarters physical combat against male opponents. The action sequences involve male characters fighting other male characters.

Tekkonkinkreet is an adaptation of a manga series. A review of the main and supporting characters from the source material and their portrayal in the film reveals no instances where a character's established gender was changed.

Tekkonkinkreet is an animated adaptation of a Japanese manga. The characters in the source material are Japanese, and the animated film portrays them as Japanese, voiced by Japanese actors. There is no instance of a character's race being changed from the source material.