Enkaku is an original character created specifically for the 2026 compilation film Shin-Gekijōban Gintama: Yoshiwara Daienjō, which adapts the Yoshiwara in Flames arc. He does not appear in the original television anime version of this story. In the film, Enkaku serves as a close aide and loyal right-hand man to Hōsen, the fearsome ruler of the underground pleasure district known as the Night King. He operates behind the scenes in the sunless city of Yoshiwara, acting as a key adversary within the narrative.

Enkaku is described as a mysterious figure, a characteristic consistent with his nature as an Amanto, the extraterrestrial beings who have taken over an alternate version of Edo-period Japan. The voice actor for the character noted that Enkaku is full of mysteries, making it difficult to discern whether he is young or old. His motivations appear to be rooted in his service to Hōsen, as he works in the shadows to support his master's oppressive reign over Yoshiwara. His role in the story is to function as a close ally to the main antagonist, adding a new layer to the conflict of the arc by presenting the protagonists with an opponent not seen in the original version of events.

The primary relationship defining Enkaku is his loyalty and service to Hōsen, whom he faithfully serves as an aide and right-hand man. Information regarding his development throughout the film, any notable abilities he possesses in combat or otherwise, or the specifics of his interactions with characters from the Yorozuya such as Gintoki Sakata, is not detailed in available sources. His introduction is part of the film's initiative to offer a renewed experience for viewers by including new animated sequences and characters not present in the television series.