Svin Glascheit

A brilliant student who shares the top two spots in the "El-Melloi Class" with Flat. At first glance, he is a jaded, calm student, but in reality he rivals Flat in problematic behavior as well. Flat calls him "Le Chien (The Dog)" as a term of endearment due to Svin's usage of Beast Magecraft, but Svin himself abhors that nickname.

(Source: elmelloi-anime.com)