Hotaru

Hotaru was a member of the five stars of the Mibu and was sent to spy on Kyo. He has great admiration for the blood-thirsty and icy Kyo and resents Kyo's softer side that has developed by coming into contact with Yuya. He also hates his older half-brother Shinrei (another one of the five) due to the fact that Shinrei is the valued "wanted son" while he, Hotaru, is the illegitimate son of a concubine.

Despite Shinrei's ignorance of the truth, Hotaru's entire life seems centered around his animosity towards his brother. All he does is counter Shinrei. Where Shinrei uses water (their father being a Master of the Muryou Saikyou Ryuu School, the water school of the Mibu), Hotaru devotes himself to fire. Where Shinrei swore to uphold the honor and wishes of the Mibu Clan, Hotaru rebelled. Where Shinrei sought strength through friendship and camaraderie, Hotaru sought strength through solitude. This prompts him to battle his former allies, the Shiseiten and Kyo, because he believes that they stand between himself and the solitude needed for true strength.

He later rejoins the Shiseiten to battle his teacher, Yuan and the rest of his former clan.

Hotaru's command of fire allows him to summon black flame, which is hotter than any normal flame, and to generate a solid shield of flame to protect himself. He reveals many techniques, among which include: Shakuran Entai (a blast of fire that covers a large area), Kaho Enbu (traps a foe in a shell with flames burning inside; when the foe attempts to break out, it causes a massive backdraft), Ma'oh-en (summons a bigger and hotter flame than Shakuran Entai), Demon's Breath (summons black fire and shoots it at his enemies), and the Hell Crusher (surrounds himself with a massive field of black flame leaving a huge crater). In the battle against his master, Yuan, he reveals his ultimate technique, Keikokuken. He fights with a double-sided sword: one side shaped like a katana, the other shaped similar to a long dagger. It is believed this sword is just one long blade with wraps and a hand guard so he can hold it.

Hotaru is the comic relief of the group. He act extremely stupid and dense, and always states the obvious. Some examples of this are Hotaru's fight with Kyo (he makes a long speech, then forgets what it was suppose to be about), When he leads Kyo's group through the Mibu palace (When asked directions, he says they should go straight, when the path ahead of them is a straight one), His battle with Yuan (When Yuan said he can beat Hotaru with only his foot, Hotaru said he will beat Yuan with only his hands), and various others.