Louie.

Fluffy (harry potter)

Cerberus (C’mon… it’s obvious)

Vulcan, Zeus, and Talona (because it has three heads)

Pyro, Aqua, and Veno

Wildfire, Tsunami, and Arsenic

Tic, Tac, and Toe

How about Cinder, Wenom and Thunder

Cerb er and ax