Penguin is a light parody of Linux users who love Tux way too much, represented by a Linux user who's tired of seeing Tux in almost every open source game for the system.
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Garret Tuxtson Johnson Linsuz was born 2450 in Nerdville. Before coming to the open arena battles he was an entertainer in a circus and featured (alarmingly) as a paint drinking penguin. Ever since losing his job, he's worn his penguin costume in the Arena purely out of spite, and simply hails by the name "Penguin".
Incidentally, his high pitched voice is due to his tightly fitting underpants.