Put a mass destruction war weapon in the body of a chihuahua and this is what you get. Cassidy is highly aggressive, but other than that, she seems like she's never used a single brain cell in her life. Her entire existence is based on saying the stupidest things at the most unexpected moments, and being the greatest danger ever known to a living being. Does she even know she exists? We'll never know, I guess. Her voice would probably be high-pitched and almost childlike, in contrast to her aggressivity.