Phineas Flynn is a fictional character from the animated television series Phineas and Ferb. He is a creative and adventurous young boy who loves to build and invent new things during his summer vacation. Phineas is known for his optimistic personality and his ability to inspire his friends, including his stepbrother Ferb Fletcher. Phineas often comes up with ambitious projects, ranging from roller coasters to time machines. He is also characterized by his close relationship with his older sister, Candace Flynn, who frequently tries to expose his activities to their mother. Despite her efforts, Phineas's inventions usually go unnoticed.