Tatsumi Daiba

 is the enigmatic brains behind the Element Network. Inspired by the murder of his mother at the hands of his father, he serves as the head of the Element Network in Japan.

Daiba originates from Until Death Do Us Part, but the series does not delve into his abilities as Alcbane, a superhero who fights against criminals. He is shown in combat in the sidequel JESUS Sajin Kouro. The manga ALCBANE, also written by UDDUP writer Hiroshi Takashige, focuses on Daiba and his Alcbane persona, but is set in a parallel universe and has no direct relation to UDDUP.

History
When Daiba was 11, he witnessed his mother's murder at his father's hand. The event traumatized him tremendously, and he claims that his mind has not aged a single day since then. Plagued by extreme insomnia, Daiba threw himself into intensive martial arts training. However, his body gradually adjusted to even that rigorous training.

Seeking a new outlet for his insomnia, he

Preparing for the Final Battle arc
When Mamoru and Igawa submit withdrawal forms to the Element Network, Daiba accepts their resignation by principle. At that moment, SPARC decides to inform him that Mamoru and Haruka are to be married in the future. Daiba is extremely shocked and, unable to process the news, becomes frazzled as he attempts to comprehend it. As he sits back down, he decides to somehow "punish" Mamoru. (Readers are never informed what exactly that punishment is, but it may be collaborating with Haruka to form Team UDDUP.)

While the above is his last in-person appearance in the series, when Pyro visits the just-disbanded Team Blade's hideout, he informs them that Team Alcbane&mdash;Tatsumi Daiba and SPARC&mdash;is returning to oversee Team Blade's former area. This gives its remaining members, Haruka, Dai, and Juliet, freedom to form Team UDDUP and head to Galboa in pursuit of Mamoru.

Other Appearances
Tatsumi Daiba and his alter ego, Alcbane, are part of the HeroXLine fictional universe, which includes the Daiba-centric manga ALCBANE. However, the HXL universe is not directly related to the Nanatsuki-Takashige fictional universe that UDDUP, JESUS, and Aegis in the Dark are set in.

In the Nanatsuki-Takashige universe, Daiba appears in UDDUP and JESUS Sajin Kouro. He also appears in the one-chapter Element Network manga, which was never released in tankobon (volume) format.

ALCBANE
Other works that Daiba appears in, related to ALCBANE and the HXL universe, include VOID, Aoi no Tachibana, Sail, NEOCROSS Triaprox-hen, and Heroyon. (This list only includes in which "Tatsumi Daiba" appears; there are more series that include only his Alcbane alter ego.)

Trivia

 * His codename, Alcbane, is an anagram of "balance."
 * In the radio dramas and drama CDs for ALCBANE, he is voiced by Tomokazu Sugita. SPARC, whose voice is sampled off his, also uses the same voice actor.
 * This also makes them the only voiced characters in the Nanatsuki-Takashige fictional universe.