Evil Bob

Evil Bob is for all intents and purposes is Bob's evil twin. Bob takes on the personality of whoever posesses his skull, Evil bob was the personality Bob had while in the possession of Heinrich Kemmler.

Evil Bob's light is a cold blue instead of his normal orange. In this state he has next to no personality. He does not share Bob's sense of humor and is disdainful of others, probably because any other practitioners looks amateurish compared to Kemmler.

In Dead Beat, when Harry asks Bob to remember what he can concerning Kemmler, Bob refused to answer unless Harry let him out for the duration of the conversation. Once out, he warned Harry about the dangers of him accessing these memories. Once ordered to do so, he tricked Harry into being tainted with a hint of necromancy, and almost killed him before being ordered back into his skull. Later, he was stolen by Cowl and assumed an alternate personality. Harry orders him to never access that part of his memory again.

Later in Ghost Story, Harry encounters a spirit which that looks like Evil Bob, When Harry asks him the meaning of the events, Bob reveals that he expunged all Kemmler related knowledge and personality so that he won't ever become Evil Bob again, and that there was a chance that he had inadvertantly created an evil spirit verson of himself. Evil Bob becomes an assistant to the ghost of Corpsetaker as she attempts to possess a new body.

Bob and Evil Bob have a showdown in the Nevernever; they appear to be equal in power.