Sigma (voiced in Japanese by Shōya Chiba and in English by Cory Yee) is a major character in the most recent arc of the Bungo Stray Dogs anime/manga series.

We're first introduced to him as the manager of the Sky Casino, which he takes great pride in, as he's trying to put on a front as a successful business owner despite having no idea what he's doing. It's later revealed that he is part of the Decay of Angels, along with Fyodor, Nikolai, and Bram.

Sigma has shaggily cut split toned hair, in white and pale lavender, and his eyes are a light pinkish color. He wears a predominantly black, white, and grey outfit, with a long sleeved black turtleneck as a base layer, with a white button-up shirt over top, tied with a light grey tie, finished off with a long white jacket with black and grey straps and trims, and a black lined tailcoat (more detailed in the manga). The rest of the outfit is a simple pair of black slacks, grey and white shoes, and white dangling earrings.

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