It does bring up an interesting point though. If he were somehow accidentally killed by, say, an artillery barrage from several miles away, the crew wouldn't have any feelings at all about killing him because they wouldn't know they did it, thus not fulfilling the condition for him to jump bodies. But of course that's never going to happen so long as his plot armor is intact.
Cegorach. He's the laughing god. Is there any doubt that he takes the cake here? Of course, there's also Tzeentch and the C'tan Deceiver. I'd put them on the same level.
or if a nid killed him...or a cron warrior....hell, harlequins would probably just feel something completley unrelated to lucius...and some eldar would probably simply feel relief as opposed to pride/satisfaction..or maybe im underestimating the arrogance of eldar.