Shivava is a stuck up Keronian who thinks of himself as the "main character." He left Keron because it was "too small" for him and joined forces with the Dark Keroro Platoon. He is rivaled with Tamama.

He is the type that does things the way he wants due to his ego. It is also evident in his speech. His speech pattern is that of someone who would be described as "rebellious" and "active".

(Source: Keroro Wiki)