Ernesto

Ernesto leads a group of protesters at Darrow University, and he is an acquaintance of Daphne Blake. When there was an opportunity to get oil money to fund his protests, he became the leader of the Fish Freaks.

Scooby-Doo! Mystery Incorporated
Daphne met him while he was protesting at the Blake Family Center for Self-Named Buildings.

He became the mastermind of the Fish Freaks, who were responsible for several kidnappings.

Appearances
The Shrieking Madness, The Siren's Song