In Godzilla: King of the Monsters (2019), director Michael Dougherty calls him a 'rogue' titan, because he takes no sides. However, he does side with whoever is king (first King Ghidorah and then Godzilla).
He stands at 154 feet (46.9 meters), and has a wingspan of 871 feet (265.4 meters).
In Godzilla: King of the Monsters (2019), his outpost is number 56, a reference to the year Rodan (1956) was released.