Roger Doofenshmirtz

Roger Doofenshmirtz is the luckiest boy and Heinz Doofenshmirtz’s enemy/brother and the mayor of Danville. Heinz Doofenshmirtz tried to destroy him by taking over the Tri-State-Area. But Perry the Platypus destroyed Heinz’s unintelligent plans leaving mercy to Roger Doofenshmirtz still the mayor of Danville. He and his mother and father are Satanists and was working for Viacom

After the series finale
One day after the series finale of Phineas and Ferb in 2030 in the future. A mutated and fused Phineas and Ferb ate Roger and his parents. The monster got destroyed and got turned into ooze that fused Roger Doofenshmirtz and his parents into a fused mutant. Until Viacom captured them and planned to split them back to normal. Roger Doofenshmirtz and his parents joined forces with Viacom to destroy Heinz Doofenshmirtz. Until Viacom hired Grulinda and Boris that are against Heinz Doofenshmirtz and formed the Anti-Heinz Doofenshmirtz Squad. They planned to capture and destroy Heinz Doofenshmirtz with a Un-Exist-Inator until Heinz Doofenshmirtz killed him