Man, the force is strong with this one.
I thought Blissex appeared as a background character in one of the Home One briefing scenes. If so wouldn't that make him as canon as Vanden Willard who only appeared in one or two short scenes in A New Hope?
That was a much LATER recton, and a very shoehorned recton at that, the film character used does not look like the art for the original West End Game Blissex, the actor Decipher pegged as their Blissex is younger, has a full head of hair and no beard, as opposed to Blissex who should be in his 80's at the time of Return of the Jedi and is bearded and bald.
Willard is named in the novels in 1976 and seen in the movie in 1977. Blissex was a creation of West End Games in 1989, and his art is depicted as such . Decipher much later used used this actor as a stand in for Blissex in their card game for the Endor Expansion in 1998/1999 some 10 years after the original character concept.
That being said I LOVE that Fantasy Flight continues to other game sources for their own material because it further builds upon gamer canon, and I think Blissex would be an ideal character/card for Star Wars Armada .
A powerful Sith he will become!