As a child, Nunu and her family inhabited the Northern fringe of Runeterra's polar region, spending their days ice fishing and huddling for warmth in the desolate landscape. Born with the ability to freeze the very air around her, Nunu became invaluable to her small village as an igloo builder, creating blocks of ice to form the foundations for the village's buildings. One day, as Nunu sat patiently next to her fishing hole, she was startled by a massive, starving Yeti that burst from underneath the glacier and collapsed miserably next to her. Feeling pity for the poor, shivering beast, Nunu offered the Yeti a fish from her bucket. With wide eyes, the eager Yeti gobbled it down, feeling much better and the two became fast friends.
Nunu actually had powers instead of just being an annoying little **** taking all the credit for Willump's hard work.