|Anime debut||Episode 2|
Tria (トリア Toria) is a minor character and an arbiter who is employed on an unknown floor.
She is distinguishable by her big blue eyes and her short pink hair. She wears traditional arbiter uniform.
She first appears alongside Novem aboard the shuttle in a cameo in Episode 2. The two both later appear at Viginti in Episode 7 when asked by Ginti if they had ever failed to judge a human. They both responded they hadn't.
- Her name is Latin for "three", though it is unknown if she works on that floor.