Even though King Caesar was not a mammal or even an organic creature, the ears standing up seemed normal for animal instincts. Almost all creatures have the natural instinct to appear more opposing to their enemies. Frill lizards for example will expand their frills to seem deadly, or other animals will stand upright to give a sense of size to their enemy.Lain Of The Wired wrote:So when he's angry his ears flop up? I thought it was for better hearing, because mecha g let out a screetch and then his ears flopped up.
One has to admit, King Caesar looks more imposing with his ears up rather than down.
Using that theory, King Caesar might have been just trying to intimidate Mechagodzilla by seeming larger, not realizing the tactic would have been wasted on a mechanical opponent.