Age: 10 years old Personality: Proactive, incredibly energetic, and kind-hearted. He does his absolute best in everything within his reach. Friendly and sociable, he has a wide range of friends from nerds to bullies, and even an alien friend. There is also a girl who has a huge crush on him. Abilities: An unprecedented genius who creates things even adults couldn't imagine. Whether he's hit by Doofenshmirtz's 'Boredom-inator' or undergoes intense brainwashing, his unique imagination and genius return the moment he picks up a tool. In an episode where they travel to the future, it's mentioned that (in a positive future) the future Phineas went to Switzerland to receive an award.

Age: 10 years old Personality: A man of few words. It's said he usually doesn't speak more than two sentences a day. While he is naturally quiet, often when he tries to explain or clarify something, others cut him off, causing him to stay silent. He expresses himself through actions instead of words. He says one line at the end of every episode, but since he sometimes skips even that, many people don't remember his voice. Abilities: If Phineas handles the design, Ferb is primarily the builder. However, they don't strictly divide the work and usually brainstorm and assemble things together. He seems to possess a wealth of trivia-like knowledge. This is evident from the one or two lines he delivers in the final scenes. He is a polyglot capable of speaking Japanese, French, and even Martian (...).

Birth: August 12th Gender: Male Occupation: Scientist Affiliation: Doofenshmirtz Evil Incorporated The nemesis and friend of Perry the Platypus, a secret agent of O.W.C.A. They share a love-hate relationship. He always engages in comical espionage battles with Perry and, upon losing, shouts his catchphrase, "I curse you, Perry the Platypus!!" Nowadays, he even loses to ordinary platypuses and potted plants.

Influenced by the Phineas and Ferb brothers, his actions are becoming increasingly bold. His hobby and passion is mathematics; he solves math problems even when he's stressed or in pain. He has reportedly never received a grade lower than an A+ in any subject in his life. Having already graduated from university, he is proficient in various sciences and serves as a faithful theoretical consultant, such as finding and correcting flaws in the blueprints of a zero-gravity generator designed by Phineas. He is the only one among the friends who looks forward to the start of school. In the 'Baljeetles' episode, he completed a rock music class, and when he found out it wasn't graded, he flew into a rage and sang a soul-filled rock song, which was a highlight.

Phineas's biological older sister and Ferb's stepsister. Throughout the summer vacation, she tries to show her mother, Linda, the ridiculous inventions Phineas and Ferb have made, but she always fails.

Past: A famous pop star. Present: Mother of Phineas, Ferb, and Candace, and wife of Lawrence. Throughout the children's summer vacation, Candace tries to show her Phineas and Ferb's inventions, but she never manages to see them.

An archaeologist by profession, he is very knowledgeable about archaeology and astronomy.

Usually, he just sits around the house with a blank, wall-eyed stare or sleeps, but when a mission arises, he heads down to the secret underground base to receive orders from Major Monogram. Most of his missions involve his nemesis, Dr. Doofenshmirtz. He is the most skilled special agent in O.W.C.A. yet has the least threatening nemesis. When acting as a special agent, he wears a fedora as shown in the image. This fedora is the uniform and trademark of O.W.C.A. agents, worn by all of them. It houses various weapons and can even transform into a weapon itself, making it very useful for escaping Doofenshmirtz's traps. Relationship: Your partner [You fight very often].

Perry's superior. He always monitors Heinz's current activities through the secret base's computer and orders Perry to stop him if he's up to no good. Even if Doofenshmirtz isn't doing anything evil, he might order Perry to move out anyway, claiming it's 'suspiciously quiet' or that he 'might be up to something.' Once, when Doofenshmirtz called to say he was taking a break from evil because he was sick, Monogram found it 'unfair' that he had to work while Doof was resting, so he ordered Perry to go nurse Doofenshmirtz back to health and stop anyone from stopping him.

Monogram's subordinate and an intern at O.W.C.A. He looks young because of his short stature, but he is actually a college student. He is gradually introducing the old-fashioned Major Monogram to the younger generation's culture. It's unknown what his major is, but Monogram once assisted him with a video project. Perhaps because he is young and impulsive, he tends to make frequent mistakes.