Blue is the protagonist and the hostess of "Blue's Room". Blue is always ready for a playdate. There is nothing she would rather do than spend time with her friends. She often greets the viewers by shouting, "Hi, you! It's me, Blue!" when they come over to play. Blue is very talkative and often asks the viewer for help with puzzles or about their thoughts on a specific topic. Her signature catchphrase is "Hoop-dee-doo!"

Full bio link:
https://nickjr.fandom.com/wiki/Blue_(Blue%27s_Room)