Boodach

Boodach, known as Ororon (オロロン) in Japan, is an EM Virus appearing in Mega Man Star Force 2. They appear during Dark Phantom's attack on the Wilshire Hills. They look like ghosts wearing a hat. They have the unique ability to fade in and out of the battlefield, stopping every so often to throw the hat at Mega Man like a boomerang. The hat of stronger varieties will move one panel to the right or left before returning.

Battle Cards
Boo Hat, known as Ororon Hat (オロロンハット) in Japan, is the Battle Card dropped by Boodach viruses. It works like the Boomerang Battle Chip from the Mega Man Battle Network series, with a Boo Hat appearing from the player's right panel and flying around the panels in the edge of the field until it reaches the player's left panel.