Vila could probably only exist *in* a show like Blakes 7. He'd never make it aboard a ship manned in a more conventional way (desirable attributes for heroes not normally including scattiness, cowardice, selfishness and self-indulgence) but he is able to stay because - *being* as it is a small group of fighters - his skills and humour, the unconventional advantages he brings, outweigh those drawbacks (well, most of the time - I doubt Blake or Cally thought they did in Shadow :-)).
And while it might be more sensible for him, as Leia says, to ask to be dropped off somewhere nice, it also makes sense that there doesn't seem to *be* anywhere that he thinks better than where he is (which, given his lack of enthusiasm for Fighting for Freedom in S1-2, and the company he is made to keep in S3-4, says something about what he came from, methinks). Maybe what they all came from.
Even in series 4, Xenon seems to still be better than being alone anywhere else ...
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