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Cassandra Phineas and Felix.
Candace has deep affection for Phineas, and also Frank.
Philip holds a special place in the heart of Candace, and also Ferb.
Cara takes delight in being with Phineas and Felix.
Fred Candy, and Foster.
Cathy shares a bond with both Phineas and Frank.
I hope you find these variations helpful!
Journey to the Center of Candace Phineas and Ferb Wiki