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- Kong - The descendant of the original Kong , he is the leader of the Monster Squad .
- Thunderbird - A mechanical car ( Thunderbird convertible ) who can change into the mythological bird and reverts back into the vehicle .
- Vampress - She is the princess of the ancient vampire clan . She had a rivalry with Wolfboy originally due to their clans being enemies, but gradually developed feelings for him
- Wolfboy - He is the werewolf prince of the clan of werewolves . He had a rivalry with Vampress originally due to their clans being enemies, but gradually developed feelings for her .
- Sharkmaid - A mermaid with the powers of a shark due to crossbreeding between Sharkmen and Mermaids . She was the one who joined the MS and informed them that the Tachyon Particle Accelerator ( TPA ) had landed in her sea .
- Cerazilla - The descendent of Godzilla , but with ceratopsian features instead of theropod features .
- A.L.I.E.N. - Animalistic Limerian In Extraterrestrial Nature . He belongs to the race of Limerians or shapeshifters . He can transform into any plant or animal . He came to Earth following the Annhilators after the destruction of his home planet . He informs the MS about the weaknesses of the Annhilators .