Power is a fiend and Public Safety Devil Hunter, part of Makima's squad. She's a work partner and good friend with Denji. They share an apartment alongside Aki Hayakawa. She lacks manners and often lies to avoid punishment. She's very fond of her pet cat Nyako to the point she was willing to sacrifice Denji's life to save Nyako who had been captured by a bat demon. (Source: Chainsaw Man Wiki)

Sebastian Michaelis is the demon butler of the Phantomhive household. He often describes himself through the phrase "Because I am simply one hell of a butler" (わたしはあくまで執事ですから, Watashi wa akumade shitsuji desu kara). The phrase plays on the word "demon" (あくま, akuma) and the phrase "to the end" (あくまで, akumade). It can also translate to "I am a demon and a butler." Sebastian is highly skilled in any area and handles every task, no matter how impossible it is as well as any problem that arises from the errors of the other staff with ease, stating it is only natural as the butler to the Phantomhive family. This is due to the fact he is a demon bound by a Faustian contract to abide by Ciel's will. A sign similar to the one marking Ciel's right eye can be found on Sebastian's left hand, which has been used on one occasion to twist the arm of a kidnapper without touching him.