Julian comes from a wealthy household and is well known in the city that in his family comes with a background of spirit guardian animals. Even though Trost is Julian's guardian their relationship is siblings-like. They love each other but they would prefer to be dead than to say it. When Trost is out of battle he has a ferret appearance but whenever he needs it he has the ability to transform into a tall knight in shiny armor. This requires him to expend a lot of energy and concentration, so it doesn't always end up succeeding, leading to funny and somewhat dangerous moments between them. If they are on the battlefield together, expect chaos.