Rowen (ローウェン, Roowen?), sometimes called just Ro by his friends, is a guardian of Arc Aile and Kuea's pleasure. He is occasionally tasked to assist with his senior in rank, Cisqua. He is a young blond-haired man that tends to dislike conflict. In contrast to the impulsive and somewhat outrageous Cisqua, Rowen is logical, polite, and considerate of others. His friends believe he is perfect in everything he does, but he realizes there are flaws for trying to perfect everything while training at Arc Aile.
Rowen appears to be the most ordinary member of the group and is skilled in the more practical ability of cooking, which none of the other members of the group appear to be capable of doing. Since they are always low on money, Rowen usually ends up performing odd jobs to make ends meet. He was actually born into a wealthy family living in comfort, but for an unknown reason, he joined Arc Aile. He is seen unused to hard work and the outdoor life like being afraid of bugs.