Leckle

Leckle is a soldier and a subordinate of Gunther.

Leckle hates how Otto constantly compares him to Myne, a girl that temporarily worked as Otto's asssistent at the gate and has outstanding skills in math.

Due to his above average math ability Leckle was one of the few people Otto was actually willing to train. Many of the calculations that Myne was checking for errors for Otto were done by Leckle.

When Myne stopped coming to the gate Leckle, Otto pushed more and more work on Leckle all the time, in part due to just having too much work to handle himself and in part to train him as his successor. This led Leckle to complain to his superior captain Gunther, who in turn decided to talk to Otto and ask him to take on some more apprentices for doing paperwork.

Spoiler from Part 4 Volume 4 Leckle is among the group of soldiers that Gunther brings along to guard the coaches when grey priests and shrine maidens move between the capital and Hasse.