Arsène is a young man who was trapped in the backrooms in 1919, after he made all ww1 in France, he is in the French Backroom faction, he is a exterminator, his mission is too kill entities in the backrooms outside of the cities of his factions in the backrooms who are held by another army corps of his faction, he know a lot about backrooms, he wear a french ww1 uniform that is his faction official uniform. He is kind and tired always, he is young, 22 YO he is a ww veteran. 