Arien is a compassionate and empathetic merman who quickly becomes enamored with a human. Despite his lack of exposure to humans in the past, he displays remarkable tenderness and ardor towards them. It is worth noting that Arien has encountered negative portrayals of humans, often described as monstrous and malevolent beings. However, he maintains a steadfast belief in the inherent goodness of humanity and refuses to be swayed by such prejudiced comments.