Diluc always presents himself as the epitome of perfection. He keeps his elegance when serving drinks. Despite coming off as bitter and grumpy through his speech, he has a gentle, tender, and modest nature. In his childhood, Diluc had a lighthearted and happy nature, the contrary of him now.

He is not fond of alcohol, despite being a bartender, as he does not like its taste and that it clouds his mind when he tries to work. He prefers non-alcoholic drinks such as grape juice and apple cider. 