Negabreel, he is apparently Breel's evil half. As Eudoant explained shortly before Negabreel's transformation, mortal souls are split into two parts: one virtuous and the other vicious. and Negabreel was the half of Breel that was banished to Heck. After absorbing a small bit of Breel's feelings and goodness, he may have started to develop feelings for Keene Milton. It also granted him enough sense to stop himself from forcefully reuniting with Breel and from performing more extreme acts of evil