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Cassandra Phineas and also Foster.
Candace has strong feelings for Phineas, and also Frank.
Philip captures the love of Candace, and also Ferb.
Cathy being with Fred and Foster.
Philip means the world to Cathy, and also Felix.
Candy is emotionally attached to both Phineas and Ferb.
I hope you find these variations helpful!
Journey to the Center of Candace Phineas and Ferb Wiki