Hmmm... I met Necrosis once... I just poped out of lane near some border staton in Kusari... result was pew pew dead... I did complain since I was not aware of character as such, but after he politely pointed me towards his stories, enounter was made clear.
Character as such... Well, story has some sense, it makes perfect sense if you are sociopath, but seen from normal perspective, it is rather absurd and unnecesary. Eg. as far as human psycology goes, killing large quantity of people as vengance is unlikely, and one would go insane or kill self after some time.
Now, no story would be interesting if hero or villain is one to stand out from norm one way or another. There are about 2000-3000 of uniqe characters in disco, and compared to population of over 40 star systems that number is nothing. Now to be honest, in those 2-3k of uniqe pesonas, there are may of 10 wanting to destroy all other life? Why the hell not.
As for originality, fellas, he is uniqe type of persona and keeps it up brilliantly, your comparison to bad rate movies does not stand. If we would criticise based on "repeating of something" dont play freelancer, because whole setting is based on stereotypes.