Tulip Olsen (voiced by Ashley Johnson) is the protagonist of Infinity Train Book One.  She is a passenger on the eponymous Infinity Train, searching for a way home.  Tulip is obsessed with finding her way off the train so she can return to her normal life.  Tulpid has glasses and ginger hair she wears with bangs and pulled back into a ponytail.  For most of the series, Tulip wears a dark gray cropped leggings, a grey skirt, and green hoodie with brown elbow patches.  She also wears a brown backpack and grey boots.  At the end of the series, Tulip wears jeans, a burgundy hoodie, and a varsity jacket.

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