Answer:
Jeremy's clumsy maneuvers during the game, particularly the description of his running: "But when Jeremy ran, his head and neck, arms and hands, legs and feet looked like a bunch of paper clips that had been shaken up in a bag: Hooked together haphazardly, they stuck out at all kinds of weird angles." (Foreshadows his choice of avatar: the complete opposite kind of runner--one who has speed, grace, and agility.)
Jeremy: timid, reserved, loner, feels disconnected and abandoned, possibly feels trapped in his existence, feels clumsy and awkward
Avatar (jaguar): strong, graceful, fast, free, beautiful (everything Jeremy would like to be)
Step-by-step explanation: