|Matheus Johan Weiss|
|Full Name||Matheus Johan Weiss|
|Affiliation||Imperial 203rd Aerial Mage Battalion|
|Weapons & Equipments|
|Military Rank|| Major (Current) 
|Novel||Chapter I The Dacian War (Vol. 2)|
|Manga||Chapter 12 Norden II (Vol. 5)|
|Anime||Episode 5 My First Battalion|
Matheus Johan Weiss is the Vice Commander and 2nd Company Commander of the 203rd Aerial Mage Battalion. He is originally from the Eastern Army and was appointed vice commander by Tanya.
He has a curved face, black hair, and black eyes. He wears his military officer suit in casual places and his battle suit during combat.
He is a prudent yet not unrelenting man. He is skilled at managing and disciplining his subordinates, making him competent at his duties. He is very concerned about his subordinates, usually taking care of the battalion in various ways and enjoying the confidence of them.
For Tanya, he is a thoughtful and reliable subordinate whom she is willing to spend much time on. She also usually chats (sometimes bickers) with him.
- Weiss has played a joke on Visha when he was drunk.