Achievement

Achievement is a very scary wario who steals livers from people and likes Wario Land 4.
He is an anomaly that occurs in Wario's Hallway in his castle. He can not be killed and is an god.
His origins is that he was an sentient AI in Wario Land 4, getting out off the cartridge and is now haunting Wario's Hallway. (Note that he is not the reason why the hallway was underwater after wario took a dump.)