jirou

Box Type: Animal
Attribute: Rain
Size: 65cm
Personality: Friendly and sociable
Skill: Special merit, drawing swords, rending with teeth, begging, sitting up, waiting in front of food until the master says "eat," throwing swords
Manga Debut: Chapter 240
Anime Debut: Episode 167
Yamamoto's Dog. The Rain Akita is one half of Yamamoto's Rain Vongola Box, with The Rain Swallow making up the other half. It is named Jirou. This dog wields three "short" Rain Blades with blades made of Rain Flames. Yamamoto can use these as a form of propulsion, much like Tsuna's Gloves, or in combat to slow down his opponent's attacks using the rain flame's Tranquility trait.
The Rain Akita Ver. Vongola is a reconstructed Rain-element dog designed for Yamamoto's exclusive use. It was created using Vongola's latest technology. Jirou is still young, so his current role is simply carrying Yamamoto's three short swords. Given his exceptional basic abilities, significant potential is expected from his adult form. His name is derived from Karahutoinu Jiro, a famous Antarctic sled dog.
Asari Ugetsu Short Blade Jirou has demonstrated the ability to wield at least one of Yamamoto's short blades. However, he has not yet been shown fighting with it in battle.