Grulinda

Grulinda is one of Heinz Doofenshmirtz’s merciless childhood foes who soaked him with water. She appeared in the episode “Imperfect Storm” in Phineas And Ferb

After the series finale
After a threat occurred in Danville. Grulinda along with Boris are hired by Viacom and joined forces with Heinz Doofenshmirtz’s anti-parents and Roger Doofenshmirtz and formed the Anti-Heinz Doofenshmirtz Squad. They planned to capture and destroy Heinz Doofenshmirtz with a Un-Exist-Inator until Heinz Doofenshmirtz soaked her with acid and killed her by zapping her with the Un-Exist-Inator