Akari Tatsushiro

is a young girl who appears in Naruto Shippūden: Ryujinki.

Appearance
She is approximately the same age as Naruto Uzumaki, with bright, red hair and a cloth covering two small horns on her head. Her eyes are the same color as her hair. The light green medallion she wears around her neck matches the one that Kuroma wears on his belt.

Plot overview
She is the younger sister of Kuroma. The two are both connected to the sealed five dragons which Kuroma attempts to release, and she herself is the host for a dragon of light. She is the one who gives Naruto the Dragon Sword near the beginning of the game to fight the Earth Dragon in Konoha, and teams up with Team Kakashi for the rest of the game to stop Kuroma.

Near the end of the game, when Naruto was fighting Kuroma, he went into his three-tailed form after seeing his friends get hurt. Akari pleaded with Naruto not to kill Kuroma, but Naruto, influenced by the Nine-Tailed Demon Fox, simply charged at her instead. Just before he got to her, though, Sakura shouted his name, bringing him back to his senses. This, however, gave Kuroma enough time to initiate the unsealing ritual to release the dark dragon sealed within himself. However, before he could actually release the dragon and transform into it, Akari pushed him out of the way, taking the unsealing for herself so that she wouldn't lose Kuroma. As Kuroma began to mourn the loss of Akari, she turned into a dragon of light. Akari then became the final boss of the game. She had six forms matching up to the elements of the previous five dragons, and Naruto had to eliminate each one before he could deal the finishing blow. Once defeated, Akari returned to normal, and she and Kuroma soon discovered that their horns, as well as Kuroma's facial markings, had disappeared, freeing them from their burden. The two departed together to lead new lives, no longer having to protect the Dragon Sword or the sealed dragons.

Trivia

 * "Akari" means "light". This is in contrast to Kuroma's name, which means "pure black".