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About my most unique eidolon was essentially a large celestial scorpion that I paired with an Aasimar summoner. We called him Slinkers and the party ended up finding out that it he was a gifted diplomat and usually let him speak for them in delicate negotiations. At one point Slinkers was given a top hat and monocle via prestidigitation when an alarmed doorman tried to keep him from attending a fancy gala by saying that "[summoner]'s... er... companion... is not properly dressed for a formal occasion."