Mugen is the 2d graphics engine that allows you to create fighting games in the style of Street Fighter, King of Fighter and others, created by the software house Elecbyte back in 1999, with the C programming language.
Thanks to Mugen you can create your own fighting game style, customizing it 100%, inserting the characters you prefer, the stages related to each character, the entire graphic interface, in short, the entire game is totally customizable.
You can read More on Wikipedia.
Akatsuchi (赤ツチ, Akatsuchi) is an Iwagakure shinobi. A war-experienced point-of-pride for Iwagakure, Akatsuchi’s unwavering loyalty to the Third Tsuchikage earned him the title as his “shield”.
In the anime, Akatsuchi was present during a council meeting to discuss an invitation from Konohagakure and Sunagakure to join an impromptu Chūnin Exams they would be hosting together. As Ōnoki arrogantly believed this was an attempt by the two villages to better gauge Iwagakure’s strength for an upcoming fight, Akatsuchi simply suggested they just turn down the offer, to which Ōnoki firmly agreed.
Akatsuchi is a very jovial individual who always seems to have a cheerful disposition. He is also somewhat childish and laid-back, witnessed through his excited at the prospect of flying once again, even though there was the possibility that they were going off into a battle. He was even excited when he thought Deidara survived the battle against Sasuke Uchiha, despite Deidara being a criminal and their enemy. During battles, however, he is level-headed and efficient as the Tsuchikage’s bodyguard. He is also fiercely loyal to the Tsuchikage, and refused to leave his side when he heard of Sasuke’s fight, just in case Ōnoki’s hip went out. Deidara also attested to the fact that Akatsuchi rarely ever leaves Ōnoki’s side when he fought the two.