Neco Arc is a parody character from the Melty Blood fighting game series, which is a spin-off of the visual novel Tsukihime. She is a cat-like, chibi version of Arcueid Brunestud, serving as comic relief with her bizarre and unpredictable behavior. Despite her small size and humorous appearance, Neco Arc possesses unique moves and references to pop culture. She often breaks the fourth wall and interacts humorously with other characters, making her a fan-favorite due to her eccentric personality and comedic role.