Pupil Sangok was an awkward teenager and a student of Master Pakku's waterbendingclasses. An idle pupil, he was often caught daydreaming or wishing he was playing ice marbles instead of honing his waterbending techniques.
During 100 ASC, shortly before the Siege of the North was executed, Sangok and Katara were matched up for a practice duel by their waterbending teacher, Pakku. Judging by his nervous expression, it was evident that Sangok feared Katara's prodigious waterbending abilities. The spar began when Sangok formed and hurled a sphere of snow at Katara, who effortlessly melted and repelled it, freezing him and thus bringing the match to a swift end. Displeased with Sangok's performance, Pakku sarcastically expressed his displeasure before releasing him from the ice.
The name "Sangok" (三個) literally translates as "Third Individual" in Chinese or what the production business calls Extra #3. The word "sangok" could also be a variation of the Japanese word "sango" for "coral", which would make sense in conjunction with Master Pakku's comment about him one day being ready to fight a sea sponge.