Draigo's just got a bad case of Marty Stue. He's too good, but not bad.
Abbaddon's just fail.
Frankly, I think Eldrad's a bit of an odd ball and deserves mention.
He's technically dead, but still in the codex. every other character, with the exception of Captain Tycho, in
40k is at least alive or presumed alive.
though, the Space Pope wins this thread hands down.