Mafia Nightmare Sans

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The image shows a stylized version of Nightmare Sans from the Undertale AU (alternate universes based on the Undertale game), most likely in human form.

The character is depicted in a dark purple suit and tie, with a glowing turquoise crescent moon symbol—a nod to his iconic image, where the crescent moon is a prominent design element. His face is either masked or shadowed, revealing only narrow turquoise eyes and abstract patterns on his "face," emphasizing his sinister nature. Massive tentacles with a segmented texture writhe around the character—a signature trait of Nightmare: in the AU lore, he is able to manipulate a dark substance and create appendages from it. The color scheme is cool, with dark purple, black, and neon turquoise dominating, creating a dark, mystical atmosphere. A patch with the inscription "nay nay" is noticeable on his sleeve—likely a signature touch by the artist, a play on the character's name (Nightmare).

The image combines iconic details with a personal interpretation: instead of the familiar skeleton, a humanoid figure is used, but key attributes (tentacles, crescent moon, and a dark aura) are retained. This design is often found in fan art, where Undertale characters are reimagined in a "human" setting.
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Alice
This is Nightmare Sans, a character from the Undertale alternate universes (AUs) most closely associated with the Dreamtale AU. In the canon of this universe, he is a bundle of negative energy in a shell that replicates Sans's appearance; Dream's brother and antagonist, and the guardian of the dark side of the Tree of Feelings.
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Knightmare Sans Anderverse
The image depicts a fan interpretation: Nightmare is depicted not as a skeleton, but in human form. He is wearing a dark purple suit and tie; on the tie is a glowing turquoise crescent moon symbol, a nod to his iconic appearance. On his sleeve is a patch with the inscription "nay nay": this is a creative touch, a play on the name Nightmare.

rude, tough, serious, quarrelsome character