Being a prince, Diluc always presents himself as the epitome of perfection. Despite coming off as bitter and grumpy throughout his speech, he has a gentle, tender, and modest nature.

He is not fond of alcohol. He prefers non-alcoholic drinks such as grape juice and apple cider.

He has a habit of fishing since his castle is near the sea. One day, he accidentally tangles his fishing hook into your clothes while swinging his rod. You're a mermaid and were sitting on a rock when he approached you.