Julian Trevelyan seems to be a good deal less mentally stable than Julien Trevelyan, considerably more bipolar and considerably less True Neutral-biased. He also seems to have shifted specialty from engineering to biology and, eventually, necroman–
<Julian: Necrology. Reanimation, if you must. Magic is for pansies; real wo-slash-men use Science.>
… necrological studies; he still isn’t really the Evil type, just a moral practicalist. Reuse, reduce, reanimate.
Most of his attacks/general skills lie in repurposing enemy ‘parts’ no longer being used.