Akatsuki (Resurrected War Demon Thunder God), is the first titular protagonist in the Akatsuki En-Eins series, starring in Akatsuki Prototyp Nr. 1, and its retitle updates Akatsuki Blitzkampf (Ausf. Auchse), except in En-Eins Perfektewelt where he is the deuteragonist.
He returns in BlazBlue: Cross Tag Battle as one of the Season 2 DLC playable characters.
A man of mystery who suddenly appeared in this world. His body is endowed with a vital secret, he acts in with utmost secrecy. Once a high ranking officer of the Imperial Army, Akatsuki was believed to have been killed in action but has managed to survive after being frozen in ice for fifty years.
After awakening from his long slumber, he returned to his homeland to discover the scenery had become all too unfamiliar. Despite not knowing left from right in this land, he fully intends to accomplish the mission that he was entrusted with: "In the event the mission fails, destroy the Blitz Motor and erase all traces of its existence".
He had an old friend named Fritz, who is still alive in the era which Akatsuki currently live in. Both Akatsuki and Fritz had been keep in touch each other relating to Gesselshaft’s abuse of using Blitz Motors ever since. He was not the original Akatsuki, but the leader of Military Technique Research facility Gesellschaft, the Akatsuki Zero who now goes by the name Murakumo (or Murakumo Zero to avoid being mistaken for Senran Kagura’s Murakumo).
There is a possibility after he defeated his universe's Murakumo that he saved En-Eins, who is a sole survivor of his cloning batch, before they begin to hunt the remaining Gesselshaft's army led by Mycale (now known as Perfecti), but in separate ways.
Akatsuki fights with his own unique style of military-based martial arts (mainly karate), with no weapon to speak of besides his military suit, Taktischeblitzanzug, and the powers he obtained via the Blitz Motor. Using the Blitz Motor, Akatsuki can use electricity in a number of ways, including shooting balls of lightning or imbibing electricity into his own punches or grabs.
- He is the first and only downloadable titular male character of his series.
- Akatsuki guest appearing in Under Night In-Birth, where he instead woke up in a different timeline that is not based on his home universe's timeline. Due to this, all characters hailing from his home series will use sprite and effect graphic styles as Under Night characters.
- Despite representing his home series, Akatsuki is still missing in Special Edition cover.