"Avon", whose electronics and computer skills were as tremendous as his greed, was just one of the astounding space characters in the renegade band of Roj Blake. The series' titular leader sparred often with his tenuous ally. But Avon was just the man Blake needed in his efforts to overthrow the totalitarian Terran Federation.
Blake's 7 was referred to by some as "Star Trek on a budget", but that did not matter since the scripting and characterizations set it apart from most television SF pap. (Still do.)
This was pure Avon:
"Listen to me. Wealth is the only reality. And the only way to obtain wealth is to take it away from somebody else. Wake up, Blake! You may not be tranquilized any longer, but you're still dreaming."
Paul Darrow could have been born to play Avon.