Kasugaigarasu, or Kasugai Crows, form the Demon Slayer Corps' vital communication network. These intelligent birds carry missions, relay urgent demon sightings in real-time, and deliver critical information across vast distances to their assigned Demon Slayers. Each crow speaks in full sentences, though typically with a loud voice and limited vocabulary. They exhibit strong loyalty to their Corps members, acting as navigational guides during missions. While most resemble ordinary crows, exceptions exist, like Zenitsu Agatsuma's sparrow companion Ukogi (nicknamed "Chuntaro"). Unable to speak, Ukogi is the sole sparrow survivor of his demon-killed family to pass the Kasugai Crow Test. Each crow receives two names: a juvenile name bestowed by Corps leader Kagaya Ubuyashiki (Oyakata-sama) and a second name given by their paired Corps member. Some prefer their juvenile name, while others, like Tanjiro Kamado's crow, adopt self-chosen names. If a Corps member dies, the crow may be reassigned, keeping the previous member's given name as a mark of respect. Notable Kasugai Crows and their assigned Corps members include: - **Tanjiro Kamado**: Matsuemon Tennoji, a highly intelligent male crow who chose his own name. He displays an abrasive manner with underlying kindness, viewing Tanjiro as his disciple. - **Inosuke Hashibira**: Dongurimaru, a male crow representing the standard. He remains wary of Inosuke due to repeated attempts to eat him. - **Muichiro Tokito**: Ginko, a female crow distinguished by feminine eyelashes. She dotes on Muichiro and avoids other Kasugai Crows. - **Mitsuri Kanroji**: Urara, a female crow wearing a clover-shaped crown matching Mitsuri's sword guard. Her frequent tea times with Mitsuri sparked rumors of a sweet tooth. - **Tengen Uzui**: Nijimaru, a male crow adorned with jewels reflecting Tengen's style, considered a fashion model among crows. - **Giyu Tomioka**: Kanzaburo, an elderly male crow prone to forgetting messages. - **Kyojuro Rengoku**: Kaname, a male crow who discreetly guided Tanjiro to the Rengoku residence after Kyojuro's death, honoring his master's wishes. - **Kagaya Ubuyashiki**: An unnamed male crow serving as his personal messenger. This crow discovered Tamayo's location and relayed Kagaya's collaboration request. - **Genya Shinazugawa**: Hashibami, a male crow initially met with Genya's indifference and noted for poor relations with Matsuemon. - **Sanemi Shinazugawa**: Sorai, a male crow who rapidly reported Muzan's attack on the Ubuyashiki estate. - **Gyomei Himejima**: Zekka, a male crow tasked with reporting battlefield changes within the Infinity Castle. - **Kanao Tsuyuri**: Isuzu, a female crow who privately worries about Kanao's difficulty expressing emotions. - **Obanai Iguro**: Yuan, a male crow who informed Obanai about Muichiro's technique for turning his blade red. - **Shinobu Kocho**: En, a female crow who delivered orders uniting Tanjiro and Kyojuro. Following the final battle against Muzan Kibutsuji, the Kasugai Crows gained their freedom. They occasionally visited the Ubuyashiki estate and their former Corps members. Ginko, Muichiro Tokito's crow, became severely ill and lost weight from grief over Muichiro's death. Matsuemon provided comfort during this time, leading to their eventual marriage.