Kuroma Tatsushiro

is the antagonist of Naruto Shippūden: Dragon Blade Chronicles.

Appearance
He is a young man with gray hair and green markings on his face. Like Akari, his younger sister, he has red eyes and small horns on his head, signifying a connection with the Genryu, the five dragons that he releases upon the world. He has numerous tags on his robe that allow him to use elemental attacks, and a large scroll strapped to his back with a dragon's head on one end. The light green medallion on his belt matches the one Akari wears around her neck, and presumably is a symbol of the Dragon Guardians. He is apparently the host of a dark dragon, not unlike a jinchūriki. However, this dragon is never seen, as Akari interrupted the unsealing process that he was attempting, allowing her own light dragon to be released instead.

Plot overview
Kuroma was first seen when the team from Konoha tracked him down to his base. He explained his motives, to release the dragon within himself to free Akari from their burden, and set up a barrier to prevent the team from entering. Once Naruto returned with the elemental orbs of the five dragons, he broke down the five barriers which each corresponded to an element, and pressed the switches behind them to release the barrier guarding Kuroma.

When Naruto finally entered into battle with Kuroma, his efforts to defeat him proved somewhat fruitless, until, all of a sudden, Sasuke arrived, having just finished a battle with Kisame up above, the latter of whom then disappeared. Having already perceived Kuroma as a threat to his plans to kill Itachi, Sasuke attacked him, but ignored Naruto. After Naruto was seemingly defeated, Sasuke left for unknown reasons, and Naruto's friends attacked Kuroma, only to be blown back by his power. Seeing his friends get hurt, Naruto went into a three-tailed state and attacked Kuroma. After Naruto had defeated Kuroma, Akari plead with Naruto not to kill him, but Naruto, influenced by the Nine-Tailed 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 to the dark dragon. 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, with the first five matching up to the elements of the previous five dragons, and Naruto had to defeat each form 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 as Dragon Guardians and hosts to the dragons of light and darkness. The two departed together to lead new lives, no longer having to protect the Dragon Sword or the Genryu.

Trivia

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