Malaise is one of the signature heroes in City of Heroes, at least half of the time.
Jean-Pierre was originally a crazed European criminal, using his illusions to rob banks. INTERPOL chased him to Paragon City, where he was confronted by Sister Psyche. After an intense battle she defeated him, and over the following months rehabilitated him. He either has split personalities, or is quite simply insane, as he can revert from heroic to villainous quite easily. When Psyche was split back apart from Aurora Borealis, she lost control of Malaise and he almost used his knowledge of the Freedom Phalanx to help the Freakshow beat them. Fortunately he was stopped by the heroes of the city.
Afterwards Ms. Liberty found him and offered him a spot on the Vindicators, in the hope that he can again be rehabilitated. Even so, many still keep an eye on him.
Malaise was formerly trainer for Independence Port, a role now taken by Aurora. He doesn't currently appear in the game other than as his Praetorian version (who is virtually identical to our version).