Dead? Hmm, player wise I would have to agree with Lyle here, Gnarl's trio of hyena's way back in old Lismore was a prime example of a player driven event that practically involved the whole sim, it also involves Xian's first shining moments when he was barely enlisted into the Guard, Gnarl himself can be an ass sometimes, but that was definitely one of his finer moments.
Staff wise...I'd have to give it to Ash with his Balrog, again because of personal involvement and experience. Xian's "Final" battle was an epic one going from him facing the Balrog on his own, to being joined and aided by various players from Lismore, all up into an emotional dying scene and quote. Now I know the Balrog isn't exactly dead, the final battle having send him and Ashtyn into somewhere far beyond, but those fights against that beast were quite enjoyable.
Hazel of course gets a mention, like Ash said, we had this grand scene at Zenko that was both a staring contest and a game of chess. I would dare say that Hazel was sort of a rival of Xian, both in the political games and otherwise. Matters became worse when Xian got sick of the game with Hazel and eventually assaulted him within the caves resulting into a fight that ended up with Xian being comatose for a while, those were good times.
Living...I'd have to say Collie honestly, the devious pirate, the man that brought Lismore into war several times and was a key player during both Great Wars.