Logan the Leprechaun is a creepy weirdo who stalks insane people, and he has been an annoyance to the League for a long time. A guy known as the Insane Knight is the only person who can see him in his full form.
Logan's is known to wear orange capes and drive Hondas around, even Honda buses. Logan also apparently hails from Russia, oddly. He is a crazy weirdo who thinks he's so cool.