Also known as: ミスタ・リアス(探偵)
The 2nd and final costume of Nijisanji EN's Mysta Rias, as seen in post #6252862. It reflects the pre-Luxiem detective lore of his character.
In it, he wears a Plaid Capelet and Plaid Coat in the Sherlock Holmes style, White Shirt, Capri Pants, Pantyhose, brown leather shoes, Red Scarf, fox-themed Monocle on his left eye, doberman-themed Hat, and is holding a Smoking Pipe and a Briefcase. His hair is tied to a Short Ponytail to his left.