The following article is an image gallery for a specific character. It contains various images from the game(s), anime, manga, novel, and/or other official images in which the character appears. As such, please proceed with caution as some images hold spoilers.
Tsumugi along with the rest of the Danganronpa V3 cast.
Tsumugi Shirogane Character Design from NDRV3 Art Gallery. 
More information from Famitsu for October 6th, featuring a new Tsumugi sprite.
A screenshot of Tsumugi from the same issue. It appears to take place in Chapter 1 and features generic free time event dialogue from (presumably) Kaede Akamatsu, she is questioning whether or not to spend time with Tsumugi.
Character Key Points; Tsumugi's being her rimless white glasses.
Promotional bonus featuring all of the Danganronpa V3 girls and a very distressed Tsumugi. This bonus is available when purchasing New Danganronpa V3 from いまじんWEB.
Promotional bonus featuring a slightly distressed Tsumugi in the centre, with Kirumi Tojo and Korekiyo Shinguji in the background. This bonus is available when purchasing Danganronpa V3 from ステラワース (stellaworth). .
Promotional bonus featuring all of Danganronpa V3 girls in pixel icons. This bonus is available when purchasing New Danganronpa V3 from Yodobashi Camera. .
Promotional bonus featuring Tsumugi and Kirumi. This bonus is available when purchasing Danganronpa V3 from WonderGOO..