Sepia is a broad-shouldered female MudWing dragonet attending Jade Mountain Academy as a member of the Silver Winglet. Her brother is likely Newt, the only other MudWing attending Jade Mountain who isn't one of Clay's sibs, although this is unknown.
While being dropped of at Jade Mountain, Moon spots two MudWings laughing and racing toward the school. Considering that there was only two MudWings sibs instead of three, it is likely that Sepia is one of the MudWings.
Sepia was later shown tramping down the mountainside with Newt to find somewhere cool and muddy to lay down with some other MudWings.
Sepia attends a history class along with the remnants of the Gold and Jade Winglets. When Winter defends Darkstalker from being a murderer, Sepia calls his sister a murderer and questions his judgment. When Winter responds that Sora was the one that blew up the history cave, Sepia calmly responds that it was because of Icicle's actions in the first place. Qibli has to step between the two to stop a fight and the class gets back to studying after an interjection from Webs.
- The term "sepia" is a reddish-brown color. It is also used as a tint or filter to images and/or videos. This is the second MudWing to be named after a color/shade of brown, the first being Ochre.
- She is mentioned to have large shoulders in Darkness of Dragons.