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Some theories about Tyrion Lannister who may or may not play an important role in the final season..
Quite a lot of speculations center on Tyrion, who always was one of the deepest and most interesting characters in the series. Neither exceptionally good nor evil, he is seen by many as a selfish and in most cases not very loyal person. He is also an excellent politician and a cunning strategist and we know he drinks and knows things.