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Basically, anything you want. It's the one thing I like most about the summoner -- it's a class that encourages you to make a story about your main class feature.
Maybe your eidolon is an imaginary friend that turned out to be real.
Maybe your imagination gave birth to the eidolon -- it's a physical representation of your fears and darkest desires.
Maybe the eidolon is your greatest invention that you end up spending a lifetime figuring out how you created it in a night of bitter drunkeness.
Maybe your eidolon is an ancestor from a distance past.
Maybe your eidolon is yourself from the future.
Maybe your eidolon is the spirit of a loved one tied to an item you own.
Maybe your eidolon is the spirit of a haunted deck of cards that lets you materialize the cards into monsters.
Maybe your eidolon is actually your wife! A magical genie you had to marry because you drew The Marriage from the harrow deck of many things.
Maybe you are the eidolon. Your corporeal body is merely a puppet you control.