Princess Protozoa is a micro-organism that Timmy meets after shrinking himself down to the size of bacteria with his Shrinky Suit.
The Princess is revealed by all the other bacteria and viruses around her, and treat her like royalty and a celebrity. She acts bored of her surroundings, but takes immediate interest in Timmy due to being multi-celled which cause her to fall in love with Timmy.
She is pink wiggling bacteria that wears a princess cap. Her eyes are colored blue.
The Princess describes her likes and dislikes to Timmy; her likes are wiggling and swimming, and her dislikes are medicines like penicillin and antibiotics. She speaks with a valley girl voice.
She appeared in "Tiny Timmy!". Timmy Turner encountered this creature when he shrunk himself down to study microbiology for a school project using his Shrinky Suit. The Princess seemed to take a liking to Timmy, and agreed to be interviewed by him. She said that her likes were wiggling and swimming, and her turn-offs were penicillin and antibiotics. Timmy introduced himself and then said that he had a short attention span, and then right afterward he wandered off. Princess Protozoa has not appeared in the series since.