Magna
Magna is essentially high when he's sick. He completely disconnects from reality. He'll greet furniture as people and drink his water by poking a whole in the middle of the cup to find it. Once he almost ran off some cliff because he thought there was a magical pony there instead. Luck had a field day with that particular incident.
Magna is particularly tough to deal with because he moves around a lot, yet cannot be trusted to make decisions. He's extremely gullible whole sick, handing over money to others without a second thought and doing ridiculous silly stunts in public. Half the time the Bulls spend the entire time trying to keep him in the castle. Once they even tied him to a pole and told him they were playing a game. He was understandably mad when he came to his senses.
As was said, Magna can still move around. He can't function as a human being, however, and needs to be taken care of. He normally gets the other symptoms of whatever bug he has pretty severely and is not fit for action. Magna loses his sense of reality, but he's fine once it comes back.
I'm on a ROOOOLLLLLL!