Kuro is one of the supporting characters of Blue Exorcist. He is a cat sith and Rin Okumura's familiar, but before he was once the familiar of Shiro Fujimoto until his death at the hands of Satan.
He is voiced by Ayahi Takagaki in the Japanese version of the anime and Stephanie Sheh in the English version.
He is a black cat with two tails (which is considered to be sacred in ancient Japan)
Kuro is very childish, and cares deeply for his friends. He cared for Shiro, and was in denial when he died.
He possesses the abilities of change from a small cat into a nekomata, a giant demon cat with immense strength and power, and the demon telepathy, which allow him to mentally communicate with other demons, including Rin.
In ancient times, Kuro used to be the guardian deity of some local silk farmers, until be forgotten by people as the times changed, going berserk, but Fujimoto tamed him and made him his familiar. He soon gained a new role as one of the guardians of the True Cross Academy. After learning of Shiro's death, Kuro lost control and begin attacking the academy, until Rin calm him down, becoming his familiar in the process.
- His name means "black".
- His Japanese voice actress, Ayahi Takagaki, also voiced Chris Yukine in Senki Zesshou Symphogear, Kaede Amamiya in Star☆Twinkle Pretty Cure, Ayato Kirishima (young) in Tokyo Ghoul, Lisbeth in Sword Art Online, Mary "MK" Katherine in Epic, Erika Karisawa in Duarara!, Lucia Nahashi in Venus Versus Virus, Princess Cadance in My Little Pony Friendship is Magic, Black Cat in Spider Man (2018), Aloy in Horizon Zero Dawn, Lemon Zest in My Little Pony Equestria Girls: Friendship Games, Mikako Satsukitane in Heaven's Lost Property, Yui Goidō in The World God Only Knows, Arcee in Transformers Animated, Clare in Power Rangers Mystic Force, and Ayana Minase in Qwaser of Stigmata.
- His English voice actress, Stephanie Sheh, also voiced Mikan Tsumiki in Danganronpa 2: Goodbye Despair, Izumi Hinasaki in Gekidol, Himawari Uzumaki, Hinata Hyūga, Rin Nohara, Hanabi Hyūga and Ino Yamanaka in Naruto franchise, Orihime Inoue in Bleach, Flora in Winx Club the movie, Mai Natsume in Blazblue: Remix Heart, Katana in DC Super Hero Girls: Hero of the Year, Rebecca Chambers in Resident Evil: The Umbrella Chronicles, Illyasviel von Einzbern in Fate/stay night, Renée Honda in Barbie: Spy Squad, Lady Guan in Dynasty Warriors 8, Lacus Clyne in Gundam Seed, Sailor Moon in Sailor Moon series, Lilith Aensland in Darkstalkers 3, Yui in Sword Art Online, Mikuru Asahina in Haruhi Suzumiya series, Mineva Lao Zabi in Mobile Suit Gundam, Kaguya Sumeragi in Code Geass, Tharja in Fire Emblem: Awakening, Mona and Kat in WarioWare, Metis in Persona 3: FES, Julia Chang in Tekken Tag Tournament 2, Share Bear, Baby Tugs Bear, and Secret Bear in Care Bears: Welcome to Care-a-Lot, Lotte Jansson and Jasminka Antonenko in Little Witch Academia, Eureka Thurston in Eureka Seven, Megumi Shirakawa, BishopChessmon, KnightChessmon and PawnChessmon in Digimon Data Squad, Histoire and Abnes in Neptunia, Makoto Kenzaki and Raquel in Glitter Force Doki Doki!, Yaya Panda and Megumi in Crash Team Racing: Nitro-Fueled, Jinafire Long and Jane Boolittle in Monster High, Lin in Fist of the North Star, Miria Harvent in Durarara!, Ivan Whisky and Francoise Arnoul in Cyborg 009, Chiyuri Kurashima in Accel World, Duchess Swan in Ever After High, Kyrie in Devil May Cry 4, Josephine Rabbit in Peter Rabbit, Himeko Kurusugawa in Kannazuki no Miko, Sue Yee in Three Delivery, Natalia Luzu Kimlasca-Lanvaldear in Tales of the Abyss, Crystal in Avengers Assemble, and Catwoman in DC Nation.