Arilla: A warrior maiden.
Age: In her 20's in Era One.
Sex: Female
Species/Race: Human - warrior maiden stock.
Alliance: Herself

Appearance: See image to the left. Line art by Spaced Angel, colorized by me.

Weapons/Skills/Powers: Arilla is a typical Warrior Maiden in many ways...skilled in forest survival, climbing, and bow hunting. She's also devious and cunning.

Background: Arilla was among a group of maidens who did not think Willa should be the one to rule. Their rebellion put down, Arilla was allowed to stay in the tribe but never quite let go of her bitterness toward her leaders.
Then, when the newcomers arrived on Third Earth, Arilla was further incensed that Willa befriended the cat tribe, seeing this as a breach of their independence. As a counter-measure, Arilla created a mutually beneficial alliance with one of the Thundercats' enemies - Monkian - having 'met him in a tree' (a canon inspiration, given Monkian's so-called 'source' from the Anointment Trials).
Monkian would cause trouble for the Warrior Maidens based on Arilla's tips, pleasing the rogue maiden by making Willa look bad. In return, Monkian would also get information about the Thundercats plans and movements. Later, Arilla befriends Felina when her and Lion-O's relationship starts to fall apart, in the hopes of sabotaging the Thundercats herself.