Sidewinder

Sidewinder is a Shingu shown only in the prequel series Akame Ga Kill!: Zero. It takes the form of a long whip-like object with a snake-patterned handle.

History
Sidewinder, 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 Green by Gozuki.

Abilities
Sidewinder's primary strong point is that it can be manipulated in diverse ways, making it a suitable weapon for surprising the enemy. Its only downside is that it's hard to use, requiring great concentration from its wielder.

Trivia
Sidewinder
 * Sidewinder is a nickname given to a pit-viper species, the Crotalus cerastes and a venomous viper species, the Bitis peringueyi, both of said species live in deserts, with the former having an unusual movement patterns and the latter being an ambush hunter. This is interesting if you consider sidewinder's unusual and hard to predict movements.