Radiates exuberance, even for the most mundane of things. This extreme energy comes across as uncontrolled and dangerous, a flurry of emotions that could at any moment snap. Maniac wouldn't have it any other way; he rather enjoys putting people on edge, pushing them until they too give in to the madness.
When asked about the strange choice of a jellyfish for a pet, he responds that it "cost him 7 pounds, but gave him life." He seems to find this immeasurably hilarious, despite no one knowing what he's talking about.