Prometheus

Prometheus is a Shingu shown only in the prequel series, Akame ga Kill! Zero. It takes the form of dual pistols.

History
Prometheus, like all other Shingu, was created four hundred years before the start of the series by the Emperor of that time in an attempt to create weapons that could surpass the Teigu.

It was kept hidden in the Empire's secret storage until It was given to Tsukushi by Gozuki.

Abilities
The weapon can cause the trajectory of its bullets to twist and turn and is capable of an array of different forms of firing. When used many times in a row, it's accuracy declines, making timing of its use critical.

Trivia

 * Prometheus is the name of a titan who sided with the Olympian gods in their war against the titans.