|Full Name||Anson Sioux|
|Other Name||Anson Sue|
|Weapons & Equipments|
|Allegiance||Legadonia Entente Alliance|
|Novel||Chapter 1 The Sky In Norden (Vol. 1)|
|Manga||Chapter 1 Prologue (Vol. 1)|
|Anime||Episode 2 Prologue|
Anson Sioux or Anson Sue is the commanding officer of the Legadonia Entente Alliance's 5th Air Mage Battalion who is first seen when they encountered previous rank Second Lieutenant Tanya Degurechaff during her first combat mission.
He is one of the antagonists of the series of Youjo Senki.
In the Plus Ultra, he was seen to be killed in action by Tanya Degurechaff by stabbing his heart during the Battle of Fjord.
In episode 11, he is finally defeated by blowing himself like Tanya did to his first company during their first encounter (Prologue).
He has the same blessing coming from Being X that is equivalent to Tanya Degurechaff's powers. However, it doesn't need an Elinium to be activate and only a prayer can do that. As seen in episode 10, he is able to enhance the damage of his bullets. Unlike Tanya, he has a a good grasp in accuracy and higher mana capacity.