does not seem to be evil, just vengeful and selfish. In fact, the only reason he trapped Danny in his poem was to teach him a lesson (and to take his revenge for ruining a masterpiece that took him who knows how long to even put the finishing touches on). Although, it should be noted that he was more than willing to break the Christmas Truce, something even the evilest and most malicious ghosts wouldn't do, suggesting that he might be extremely impulsive