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Alva is a short statured woman with curly white hair, stubble, and big ears. She wears a pink hat and robe and appears to be very old.
She is a grandmotherly-type of person who speaks Swedish, as Finn was not able to effectively communicate with her; they relied on gestures and drawings.
There's little known about her personality since she does not speak the same language as Finn and Jake. From the home movie she was watching with Finn, it shows that she cared deeply for her scientific research team who disappeared or were eaten by the creatures on the island. She's the only survivor, being able to use technology and her instincts to accomplish this.
Alva has the ability to tame big creatures such as her gigantic parrot or her bear mascot, Albert, who helps her when she is in need.
She also has access to very advanced human technology, including energy shields that allow her to survive the violent storms on the island.