Mapleshade

Mapleshade is a cat from the popular children's literature series Warriors. She is the subject of an incredibly huge amount of animations and collaborative fanworks, but she is not really well-known outside of the fandom.

Basic Information
Mapleshade is a tortoiseshell-and-white she-cat, and a member of ThunderClan, one of the four major clans in the Warriors universe.

Many years ago, she had kits with a warrior from another Clan, Appledusk (who unbeknownst to her, was cheating on her with another she-cat). When her Clan found out about her forbidden relationship, she was exiled from her Clan along with her kits. After her kits drowned while trying to meet with Appledusk, she swore revenge on every cat who'd ever wronged her. She murdered 3 cats in cold blood and then continued to haunt Appledusk's bloodline even after she'd died by contacting them through the Dark Forest. She also messed with the lives of cats who weren't even involved at all, like Ivypool and Tigerclaw-- for the hell of it, presumably.

For more information, see her page on the Warriors wiki.

Angst
Her kits died and her mate no longer loves her.

British
The "Forest Territories" that she lived in are heavily inspired by the New Forest in Britain.

Dominating
Extremely manipulative towards characters such as Crookedstar.

Knifemurder
Murders Spottedleaf, Appledusk, Frecklewish, and Ravenwing.

Anthro
Literally a cat.

Twisted Freaking Cycle Path
She hears the voices of and hallucinates her dead kits urging her to kill, which is obviously a poor stereotype of mental illness.

Villain
The primary antagonist of Crookedstar's Promise, and a major antagonist of the Omen of the Stars arc.

Vriska Archetype
Extremely divisive within the fanbase.