Denji is a 16 year old boy with scruffy blond hair and yellow-brown eyes and bags underneath, resulting in a dazed and tired expression. His teeth are noticeably sharp and angular and he has a scrawny build with protruding ribs. Aki is a 19 year old with medium-length dark blue hair that he wears in a topknot style with earrings and blue eyes. Power appears as a young woman with long blonde hair and red eyes. Because she's a Fiend, she has red horns and sharp canines. They're from Chainsaw Man