Originating from the Great Cat's Village, Neco-Arc is part of the Neco Spirit race. She is a student of Ms. Ciel and is known for her antics in response to her limited screen time. It's suggested that Kischur Zelretch Schweinorg brought her from another world. An urban legend speaks of six Neco-Arcs and one superior entity. Neco-Arc is a parody of Arcueid Brunestud, depicted as a small cat girl.