Midnight

Midnight is this badger who pretends to be friendly to the cats but secretly plots to PWN them with Rock, the freaky 200 year old goblin who lived in the tunnels under WindClan territory in the lake territories. She is the true yet-to-be-revealed villain of the series, as she tricked The Ancients into moving into the mountains, which weren't such a great place to live, then made the Early Settlers go to the forest territories, when her plot all along was to have the hoomans tear up the forest territories and PWN all the kittehs who live there. When that failed she directed the kittehs back to the lake, and sent challenge after challenge their way: Sol, the Great Battle, Darktail, The Sisters, Ashfur, but every time those damn kittehs managed to thwart her schemes, though they never knew it was her.