Maybe it because I didn't watch the series, but I thought Frenzy was perfect. His personality is of a person who is so smart that they are dangerous. Most extremely smart people have no common sense. Look at how dies. He is trying to accomplish his mission and does something without thinking about the consequences showing his lack of common sense. He shoots one of his blades at the humans attempting to kill them, but doesn't think about what the consequences are for himself, and it results in his own injury. Also, he is such a major part of the humor of the film. The audience I was with laughed the most at him.