Enigma is a purple humanoid Stand with question mark patterns that can transform objects and people into paper by capturing their fear-induced habits. Terunosuke uses Enigma to seal individuals in paper, reflecting any damage onto the trapped person. Josuke defeats Terunosuke with the help of Yuya by sealing him in a book. Terunosuke targets Koichi and captures him and Josuke's mother using Enigma's abilities. Terunosuke enjoys instilling fear but can also be cowardly.

Stray Cat is a Stand with air manipulation abilities linked to photosynthesis. It has cat-like traits, aggressive tendencies, and a grudge against Shinobu Kawajiri. It enjoys typical cat activities and dislikes cigarette smoke and being cold. It retains its vindictive nature and laziness even after becoming a plant.

Arnold is Reimi Sugimoto's loyal guard dog in Diamond is Unbreakable. He was killed by Yoshikage Kira and remains as a ghost alongside Reimi in a ghost alley. Arnold's loyalty is shown when he defends Reimi from Kira's attack, ultimately leading to Kira's demise. After Kira's defeat, Arnold and Reimi ascend to Heaven, finally finding peace.

Carole is a determined and passionate orphaned girl with a bright and outgoing personality. She bonds with Tuesday and has a big sister instinct for her. Despite her talent for music, she struggles to hold down part-time jobs due to her straightforward nature. Carole is independent and hesitant to rely on others due to past experiences of bullying and hardships. She is quick-witted and sometimes lets her brazenness get the best of her. Carole's style ranges from casual overalls to a stylish leather jacket and miniskirt.

Smile Dog is a demonic husky entity associated with a haunted image known as smile.jpg. Victims who view the image are tormented by the creature in their dreams, compelling them to spread the image to others. The entity induces fear and psychological torment, leading victims to their demise.

Sally is a female chick in LINE Friends, often seen as Brown's little sister figure. She has yellow feathers, tiny black eyes, and an orange beak. Sally is depicted as naive, clever, and sometimes cunning due to seeking attention. In the Netflix series, she is focused on witchcraft studies and is easily distracted by friends. Despite being a background character, Sally has gained many fans. She is often seen with Brown and has been mistaken for a duckling, leading LINE to clarify her species in a skit cartoon.

Legends of the kuzuryū, or nine-headed dragons, are found in various regions of Japan. These divine beings are associated with power over rain and water, with stories dating back to ancient times. In Buddhism, kuzuryū are linked to enlightenment and protection. One famous tale involves a monk saving a village from a malevolent kuzuryū in Lake Ashi, leading to its transformation into a protective spirit. Another story tells of a monk encountering a kuzuryū on Mount Haku, leading to the establishment of the Hakusan Faith and the naming of the Kuzuryū River.

Cony is a white rabbit character in LINE Friends known for her adorable appearance but bad-tempered nature. She is gluttonous and has a close relationship with Brown. Cony is one of the original characters, popular among fans, and best friends with Sally.

Choco is a sociable female bear who loves gossip and selfies, she wears different clothes daily, with a peach-colored dress and yellow bag. She is Brown's younger sister in the LINE Friends group and shares a birthday with James.