Of course, Zim fails purely because he gets distracted by Zimberly, and his ego takes over as Dib attempts to flop his plan. Usually, this has gone south into a bumping contest, or north into Zim dying instantaneously.
As an enemy
Zim has taken some drastic measures, such as kidnapping Zimberly or not so very much, like the bumping contest. He has always tried to rule over Dib and has sometimes attempted to kill or murder him.