She is Jeremy's little sister, who bares her hatred of Candace because she steals Jeremy's attention from her. To get even, she often plays mean tricks on Candace and even trained her poodle to do so as well. Jeremy often comes back for Candace, leaving Suzy angry and confused. Even Buford Von Storm is terrified of her. Suzy left her evil personality behind when she's an adult and marries Sidney Jones.
Phineas and Ferb: Forever Summer
She and her friends and family are older and the setting is in the future in this series. Since her brother is married to Candace, Suzy is now her sister-in-law.
She is a minor antoginist in this show. She appears in Epsiode 3, where she is mean at beginning then good, but then she says "It's so hard being nice *alarm rings* Oh! yay time to be mean again".
She appears in the television special, Jenny With a Chance: Christmas Special.
She does not appear in season 2.
Jeremy Johnson is Suzy's older brother.
Candace Flynn is Jeremy's girlfriend and Suzy's nemisis
Jimmy Nelson is Suzy's crush, She respects him because he will not let anyone date his sister much like she will not let anyone date Jeremy.
Cain Rangle Johnson is her older cousin, but like Candace, he knows that Suzy is a "devil".