Celestia Ludenberg

Celestia Ludenberg is a main character in the first game of the Dangan Ronpa series. She is known for lying to and manipulating others. Her most notable actions in the series were manipulating Hifumi to kill Kiyotaka, then killing Hifumi herself.

In the Cosmic Fisticuffs Series
In the first game in the series, Celestia is a starting character. She starts off as a villain being revived by Herobrine as her servant, but after being defeated by the heroes she decides to join them.