El Merlo Loco is a combination of a Mexican wrestler and the wizard Merlin. He is what Benny dressed up as for Ethan's Halloween Party.
Rory accidently turns Benny into the real El Merlo Loco after Rory was possessed by Taquaks Mask . El Merlo Loco can only speak Spanish but seems to understand English. He breaks the curse in Halloweird by blasting Tauquaks Mask off of Rory with lightning.