Sepia is a broad-shouldered female MudWing dragonet attending Jade Mountain Academy as a member of the Silver Winglet. Her sibling is likely Newt, the only other MudWing attending Jade Mountain who isn't one of Clay's sibs, although this is unconfirmed.
While being dropped off at Jade Mountain, Moonwatcher spotted two MudWings laughing and racing toward the school. Considering that there were only two MudWings instead of three, it was likely that Sepia was one of the MudWings and the other was her (possible) sib, Newt.
Sepia was later shown tramping down the mountainside with Newt to find somewhere cool and muddy to lay down with some other MudWings.
Sepia attended a history class along with the remnants of the Gold and Jade Winglets. When Winter defended Darkstalker from being a murderer, Sepia called Icicle a murderer and questioned his judgment. When Winter responded that Sora was the one that blew up the history cave, Sepia calmly answered that it was because of Icicle's actions in the first place. Qibli had to step between the two to stop a fight and the class got back to studying after an interjection from Webs.
- The term "sepia" refers to a reddish-brown color. It is also used as a tint or filter to images and/or videos.
- Sepia is the third MudWing to be named after a color/shade of brown, the first two being Umber and Ochre.