No, Enmu is not non-binary.
Enmu, a character in the popular anime and manga series Demon Slayer: Kimetsu no Yaiba, possesses certain characteristics that can lead to questions about their gender. With neutral features and a distinctive slow, drawling voice, Enmu's presentation often leads viewers to perceive their gender as ambiguous.
However, despite these ambiguous traits, Enmu is, in fact, male. The character is definitively identified as male within the lore and is also known for their sadistic tendencies. Therefore, while their appearance might suggest otherwise to some, Enmu's gender identity is male, not non-binary.
For more information on Enmu's character, you can refer to discussions from credible sources.