Part Of Me

Part Of Me is Birthday's sister. She is bullied by Starships.

Official Description (Season 1 & 2)
''Part Of Me is Birthday's sister. She is bullied by Starships. She's also very kind and will help anyone who needs her!''

Official Description (Season 3)
''Birthday's sister is still mostly the same. Starship's bulling has caused Part Of Me has actually caused her to cause self-harm. She also finds out her true self and is transgender.''

Trivia

 * When she becomes male she chooses the name Sorry.
 * In "The Last Goodbye" she was supposed to commit suicide but the plot was changed.