The the movies of the Monsterverse have struck a balance between bringing back beloved giant monsters from previous eras of Godzilla and putting forward their own original creatures. That being said, there are plenty of kaijus from Godzilla's history yet to be used that could easily fit in as Titans in Legendary Pictures' Monsterverse.

Other than Godzilla and King Kong, the Monsterverse has already introduced several returning characters from the classic eras of Godzilla, including King Ghidorah, Mechagodzilla, Mothra, and Rodan. The series has since left plenty of promising concepts for monsters on the table, with many of Toho's old designs making perfect sense for the lore of the Monsterverse's hollow earth. Hopefully, future Monsterverse movies can continue to fill out the franchise's roster of returning kaiju.

10 Baragon

The Quadrupedal Beast

A perfect candidate for a natural Titan in the Monsterverse, Baragon is a modest monster that would feel right at home in the new franchise. Originally, Baragon actually appeared in his own film, 1965's Frankenstein vs. Baragon, in which he squared off against a giant version of the classic Universal movie monster.

A four-legged reptile from beneath the Earth, Baragon is known for his ability to rapidly tunnel through the ground and fire bursts of magma from his mouth, not to mention his helpful glowing horn located in the center of his face. Already hailing from beneath the planet's crust in his original lore, Baragon would be a perfect fit for the biome of Hollow Earth.

Sometimes depicted as a villain and sometimes depicted as a guardian, Baragon could fill multiple roles in a Monsterverse movie. Baragon is also famous for being one of the few Toho monsters to be played by a female stunt performer in his physical suit, Rie Ota, who was famous for getting into character by doing her own roars while on set.

9 Megalon

An Insectoid Burrower

Speaking of burrowing monsters, Megalon is another obvious pick for a subterranean titan in the Monsterverse. Rather than quickly digging with mole-like claws, Megalon instead utilizes his deadly drill hands to quickly carve a path through solid rock. He's also a threat from a distance with his horn, which can generate and fire deadly blasts of yellow lightning. Megalon first appeared in the 1973 film Godzilla vs. Megalon.

Regardless of his affiliations, Megalon would be a dangerous, nasty villain to throw at the powerful Legendary Pictures Godzilla next.

Megalon acts as the guardian and god of the underground nation of Seatopia, who seeks revenge on the surface world after nuclear tests ravage Seatopia's territory. Since Godzilla x Kong: The New Empire already introduced two sentient civilizations populating the Hollow Earth, Seatopia would be easy to retroactively add. Regardless of his affiliations, Megalon would be a dangerous, nasty villain to throw at the powerful Legendary Pictures Godzilla next.

8 Gigan

A classic Spacefaring Godzilla Villain

If there's one iconic Godzilla villain that deserves to be in the Monsterverse, it's the alien warrior Gigan. A strange-looking beast, Gigan is roughly humanoid, with a red, visor-like eye that can fire lasers, strange, forward-folding wings that sometimes allow him to hover, a mohawk-like fin on his head, and an avian beak.

Dripping with weaponry, Gigan is notable for being the first creature to ever make Godzilla bleed on-screen in Godzilla vs. Gigan, sporting bladed hooks for hands, and a forward-facing buzzsaw running along his stomach. With his bizarre collection of powers and weapons, Gigan is a formidable alien monster who invades Earth in multiple instances.

In Godzilla Final Wars, he gets even more upgrades in a dramatic redesign, adding chainsaw hands and grappling hooks to his bag of tricks. One of Godzilla's more famous recurring enemies, it's about time Gigan shows up in the Monsterverse, expanding upon the presence of alien wildlife setup by King Ghidorah's Godzilla: King of the Monsters origin.

7 King Caesar

A Humanoid Guardian Of Humanity

The Monsterverse has begun to make some of its Titans more chummy with the human race than any other Godzilla continuity, with the humans directly aiding Godzilla and Kong in their fight against threats to the Earth. This might make King Caesar a great kaiju to explore next, considering his history as a magical guardian of the Earth.

Based off the iconic Chinese lion statues, King Caesar is a shockingly human-looking monster, with long, rabbit-like ears and feet that make him a bouncy, agile fighter. King Caesar first appeared in Godzilla vs. Mechagodzilla, where he helps the former fight against his cybernetic copy after being summoned by his loyal masters, the Azumi royal family.

Even if Mechagodzilla is already currently defeated in the Monsterverse, it's possible for a second iteration of the mechanical beast to arise, perhaps prompting a response from King Caesar. Caesar could stand as a foil to King Kong, another kingly protector of humanity who fights with mostly physical means. The exception is King Caesar's special eye beams, which can absorb and reflect energy attacks.

6 Anguirus

Godzilla's Faithful Spiky-Shelled Comrade

Already having a shaky case as a postmortem cameo in the Monsterverse, Anguirus is a legacy monster who deserves to make a full appearance. One of the earliest monsters introduced in Godzilla canon, showing up in the very first sequel to the original Godzilla, Godzilla Raids Again, Anuirus began as an enemy.

Soon, he became one of Godzilla's most reliable allies in other movies, aiding him in battles with his spiky shell, ability to curl into a ball, and tireless resolve. Anguirus, or at least another member of his species, made an appearance as Godzilla: King of the Monsters.

The massive fossil of the ankylosaurus-like beast is briefly seen in the ancient underwater ruins Godzilla briefly retreats to. It's never been hard confirmed that this individual cadaver is the Anguirus, meaning that the actual named monster could still show up as a Titan in later Monsterverse movies.

5 Titanosaurus

An Aquatic Beast Exploited By Humanity

The Legendary Pictures Monsterverse has already flirted with some briefly-seen sea monster designs. Godzilla kills the pink-energy-imbued Tiamat in Godzilla x Kong: The New Empire, and Kong squares off against the powerful Kraken in the Skull Island animated series. But with both Titans currently dead, the Monsterverse could use some fresh blood in the water, and Titanosaurus is a great pick to fulfill the niche of an aquatic kaiju in the franchise.

Originally appearing in Terror of Mechagodzilla, Titanosaurus is a massive reptile with fins, including a fishy mermaid-like tail. Titanosaurus can use this tail to generate powerful gusts of wind on land and whirlpools in the sea, causing untold destruction to human structures. In his debut appearance, Titanosaurus is controlled with human technology, a plot that feels par for the course for the antics of the Monsterverse.

4 Ebirah

The Horror Of The Deep

Titanosaurus isn't the only Toho sea monster that would feel right at home in the Monsterverse. Enter Ebirah, a one-off Godzilla villain that still provided the King of the Monsters with one of his most memorable giant monster battles. Ebirah can easily be described as a giant lobster, first showing up in Ebirah, Horror of the Deep as the byproduct of nuclear waste being haphazardly dumped into a marine environment.

ittedly, Ebirah doesn't have the best combat record, losing twice to Godzilla and once to armed humans in his two appearances. After Scylla's death in Godzilla x Kong: The New Empire, the niche of a crustacean Titan is left wide-open, something Ebirah could fill in for.

While Ebirah might not have any particularly special combat abilities, which Godzilla famously rips off in its debut film, the creature is notable for being particularly durable. Indeed, Ebirah's hard shell is one of the few materials that have withstood a direct blast from Godzilla's atomic breath, something which has as of yet been unstoppable in the Monsterverse.

3 Varan

The Gliding Mountain God

A relatively obscure Godzilla monster, Varan actually began life in his own self-titled feature film, Varan, in 1958. Here, Varan is introduced as a prehistoric reptile in the mountains who emerges to attack Tokyo, only to be put down by the military.

He re-appears in Destroy All Monsters, showing up in a multi-monster brawl, and almost starred in a more dedicated team-up movie with his name in the title before it was scrapped by Toho. Varan is most well-known for his webbed limbs, similar to those of a flying squirrel, which allow him to soar through the air in a limited capacity.

In addition to air and land, Varan is quite capable in the water as well, almost outdoing Godzilla's own aquatic capabilities. Though he might not be the most threatening monster, Varan is just the type of oddball creature that would be perfect to fill out the ranks of the Earth's Titans in the Monsterverse.

2 Biollante

An Apocalyptic Plant-Based Monster

While animals, dinosaurs, mythical creatures, aliens, and sealife are all fascinating inspirations for kaiju, Biollante is unique as the only sentient flora to give Godzilla a run for his money. A mutant created by a rogue scientist's genetic meddling in Godzilla vs. Biollante, Biollante is formed from the DNA of a rose bush, Godzilla himself, and the scientist's own late daughter, making her one of the few female monsters to form Toho's ranks.

With an absolutely massive size, even for a Godzilla villain, a deadly maw lined with razor-sharp teeth, and tentacle-like vines, Biollante is more than a worthy foe. As a more recent Godzilla monster, Biollante ittedly might not have the same legacy as some of Toho's other options for incorporation into the Monsterverse.

However, as a singularly unique being in the series, Biollante would be a great twist for the next major Godzilla villain. Her very human origins would also be a great way to tie in the Monsterverse's human cast, which has been increasingly sidelined as the series has progressed.

1 Kamacuras

Swarming Mantis Monsters

Not every Godzilla monster is a single individual. Just like how the Skullcrawlers in Kong: Skull Island or the MUTOs of 2014's Godzilla are more of a species than a named legendary monster, the Kamacuras serve the role of swarming wildlife in the Godzilla universe.

The beasts take the form of giant praying mantises, mutated to a colossal size by the experiments run by the United Nations on their home territory of Solgell Island. The Kamacuras first appear in Son of Godzilla, where they harass Godzilla's newborn child, Minilla.

The Kamacuras might not be a titleworthy threat, but that only makes them easier to slot into a Monsterverse movie as ing antagonists.

The Kamacuras might not be a titleworthy threat, but that only makes them easier to slot into a Monsterverse movie as ing antagonists. The massive mantis monsters would be great to fill out the wildlife of Skull Island or the Hollow Earth's hostile biome, which was elaborated upon in Godzilla x Kong: The New Empire. The Kamacuras are a no-brainer for the Monsterverse to include as a Toho throwback for patient fans in an movie.