Raven is a shady, laid-back member of the group who seems to know more than he lets on. He first encounters Yuri in the castle prison and allows Yuri to escape by slyly sneaking him a jail key between the bars of his cell. Raven frequently causes the group to run into trouble early on, harboring feelings of unease from the rest of the party. He often complains about his age and work load, causing the group to refer to him as "old man." He is apparently a veteran of the Great War, which took place ten years before the story; however, he does not like to talk much about his experiences.
Source from Wikipeida