Kerberotte-chan

ケルベロッテちゃん

Kerberotte (Keruberotte), also known as Berotte or Berotte-chan, is the main protagonist of the omake "Kerberotte Take Me to Hell!!" She serves as the gatekeeper of hell, and her series focuses on her ongoing struggle with a fallen angel whom she attempts to send to hell. Although physically present in the same world, characters from the main series do not seem to know or notice her. The only characters from the main storyline she has interacted with are Emile, the train conductor, and Flandre (Nakua saw her in the video from Sherwood's camera in the third OVA, but decided to erase the parts containing her for unknown reasons). She also appears to have the ability to "jump" between timelines, such as when she appeared in the alternate future timeline. The future Hiro noticed a presence but could not seem to see her; similarly, she sensed Hiro but could not see him.