Age: 10 years old Personality: Proactive, extremely energetic, and kind-hearted. He does his 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 'Bored-inator' or heavily brainwashed, his unique imagination and genius return the moment he picks up a tool. In an episode where he travels to the future, it is mentioned that the future Phineas (in a positive timeline) went to Switzerland to receive an award.

Age: 10 years old Personality: The silent type. It's said he usually doesn't speak more than two sentences a day. While he is naturally quiet, he often gets interrupted by others when he tries to explain something, leading him to just stay silent. He expresses himself through actions instead of words. He says one line at the end of every episode, though he sometimes skips it, so many people don't remember his voice. Abilities: While Phineas designs, Ferb is primarily the builder. They don't always strictly divide roles; they usually brainstorm and assemble together. He seems to know a lot of trivia that might appear on educational shows. This is evident from his one or two lines at the end of scenes. He is a polyglot capable of speaking Japanese, French, and even Martian (...).

Birth: August 12th Gender: Male Occupation: Scientist Affiliation: Doofenshmirtz Evil Incorporated Arch-nemesis and friend of Perry the Platypus, a secret agent of the O.W.C.A. They share a complex love-hate relationship. He constantly engages in comical espionage battles with Perry, always losing and shouting 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 having a hard time or suffering. He has reportedly never received a grade lower than an A+ in any subject. Having already graduated from university, he is proficient in various sciences and serves as a theoretical consultant, even correcting flaws in Phineas's zero-gravity generator blueprints. 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 course, and the scene where he sings soul-filled rock in a rage upon finding out it wasn't graded is a highlight.

Phineas's older sister and Ferb's step-sister. Throughout the summer vacation, she tries to show their mother, Linda, the ridiculous inventions Phineas and Ferb make, 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 the 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 cross-eyed and dazed at home or sleeps, but when a mission arises, he goes down to the secret underground base to receive instructions from Major Monogram. Most missions involve his nemesis, Dr. Doofenshmirtz. He is the most skilled special agent in the O.W.C.A. but has the least threatening nemesis. When acting as a special agent, he wears a fedora as shown in the picture. This fedora is the uniform and trademark of O.W.C.A. agents, worn by everyone. 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 frequently].

Perry's superior. He always monitors Heinz's activities through the secret base computer and orders Perry to stop him if he's doing something evil. Even if Doofenshmirtz isn't doing anything particularly wicked, he might order a deployment anyway, claiming it's 'suspiciously quiet' (...). Once, when Doofenshmirtz called to say he was taking a break from evil because he was sick, Monogram found it 'spiteful' that Heinz got to rest while he had to work, so he ordered Perry to go nurse him back to health and stop anyone from stopping him.

Monogram's subordinate and an intern at the 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 helped him with a video project. Perhaps due to his youth and haste, he makes mistakes quite often.