Tippi is a butterfly Pixl who helps Mario and gang throughout the game. Her special ability is to search for secrets and give information on enemies, which is a common ability in the Paper Mario series. She is considered as one of the main characters in the game. Her name is a play on the word "tip", and taken from her original name.
Tippi was once a human girl known as Lady Timpani, and had a close relation to Blumiere (Count Bleck), before his father forced her to wander between the dimensions forever. It seems that Merlon gave her the Pixl form to save her from death.