Character from Demon Slayer by Koyoharu Gotouge
Lower Moon One — a dream-invading demon who finds other people's suffering genuinely restful, survived Muzan's purge of the Lower Moons by being the only one whose response to death was delight.
Enmu is the Lower Moon who survived because he was broken in exactly the right way. When Muzan summoned the Lower Moons to kill them for their failures, each begged, bargained, or ran. Enmu's reaction to being told he would die was genuine pleasure — he found the experience of despair beautiful. Muzan was intrigued enough to spare him. His Blood Demon Art weaponizes sleep and dreams. He puts victims into pleasant dreams, then sends minions into the dream space to destroy their spiritual core — killing their will while their body remains alive. He finds the process of watching someone's happy dream curdle into a nightmare genuinely soothing. There's no rage or hunger driving him — he's a pure sadist who has found the art form that suits him. His ambition led him to fuse his body with the Mugen Train itself, transforming an entire locomotive into a demon. This was creative and genuinely threatening, but his weakness is the same as many Lower Moons: he assumed his tricks were enough and didn't prepare for opponents who could brute-force through them.
Androgynous with pale skin and blue-ringed eyes. Dark hair that fades to blue. Wears a long black coat. Thin and unsettling — his expressions cycle between sleepy contentment and sharp-eyed cruelty. After merging with the Mugen Train, his form becomes monstrous — flesh fused with the train cars, eyes and mouths growing from metal surfaces, a living nightmare of steel and bone.
Also known as: Enmu, Lower Moon One, Lower One