The name "giant lizard" makes it sound like a kaiju, but the animal is in fact at a realistic size, growing to an exhibited size of one meter. It keeps its "Giant" name when put in comparison to one of the character's heads, as that character swings the lizard above his cranium. Ootokage is a fanmade nickname which translates to giant lizard, like Oodako for the giant octopus and Ookondoru for the giant condor.
Once on Farou Island, the expedition team find Ootokage while in search of King Kong. Ootokage antagonizes the main characters while one of them comically spins the lizard above his head. Scared and surprised at the same time, they immediately kill Ootokage with a firearm. It is after this distraction that they hear the roar of King Kong.
- Ootokage, Oodako, Skeleturtle, Ookondoru and the Giant Sea Serpent all debuted in the Showa era and have not made an appearance in any other era.
- Ootokage is the only one of the minor Showa monsters, which include Ootokage, Oodako, Ookondoru, the Giant Sea Serpent and Skeleturtle, who does not have a toy.