Mandy (The Grim Adventures of Billy & Mandy, seasons 5 and 6)

Mandy is one of the major characters from The Grim Adventures of Billy and Mandy who is the owner and friend of Grim along with Billy, unlike Billy's happy-go-lucky personality, Mandy's is much more sinister and gothic and she barley even smiles, she is voiced by Grey DeLisle.

Why She Lost All of Her Charm
NOTE: This is only focusing on the seasons 5-6 version of him.
 * 1) Unlike her personality from seasons 1-4, she is much more meaner and has done several evil acts then she once did.
 * 2) She along with Billy are huge bullies towards Grim.
 * 3) She doesn’t seem to care that much about Grim and Billy anymore.
 * 4) Unlike in the previous seasons where she was much more laidback and calm, her temper is much shorter and beats up Grim, Billy, and Irwin just for fun.
 * 5) She was at her worst on "Scary Poppins" where she brainwashes everyone in Endsville to follow her orders instead of becoming a much better person.
 * 6) She holds Numbuh 1 (from Codename: Kids Next Door) hostage just so she can be leader of KND on The Grim Adventures of KND.
 * 7) She usually betrays her friends.
 * 8) On "The Greatest Love Story Ever Told Ever", it is revealed that Mandy went on a date with Nergal Junior just so she can watch Irwin and Nergal Junior fight and ruin Valentines Day for everyone.
 * 9) She also seems to do stuff that's just as dumb as Billy would do.
 * 10) She along with Billy barley get punished for their actions.

Redeeming Qualities

 * 1) She was much better and more tolerable in seasons 1-4.
 * 2) There were still moments where she cares about Grim and Billy, especially in Billy and Mandy's Big Boogey Adventure where she showed sympathy towards Billy when she thought that the sea monster ate him.
 * 3) Grey DeLisle did a good job voicing her.