"Bobo Fever" (also called "Bobo Sickness") is a condition caused by exposure to the Hammer of Bobo's ability to store spirits in itself. Victims can recover from the condition if their soul leaves the Hammer of Bobo as soon as possible when symptoms are sighted. However, Bobo Fever can be fatal if left untreated. JJ Nikster is one such victim of this condition, though he tries to recover from the condition in JJ Nikster 3: Eastern Operation. Test Subject 98, an imperfect clone of JJ, is a victim completely corrupted by the condition.
- Dark personality
- Slight insanity
- Bigger desire to hurt someone
- Slight decrease in vision when near a supernatural being