"We have to get the Fifty (character) to stop!" — Ones This page is protected from being moved, though users can still edit it.
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Fifty has fifty light-blue blocks with blue borders. She additionally has two eyes, one with a steel blue shooting star; the star being gold, and a pink mouth. She lastly has steel blue limbs and an array display because she is a super rectangle (6 factors).
Her "shooting star" eye has glitter on it, only visible when exposed to direct light.
She is the first Numberblock who has never made non-rectangular arrangements anywhere, if the intermediate arrangements seen for one frame during rearrangement doesn't count.
She is the third Numberblock to appear right before their namesake episode, the first being Two the second being Eleven and the fourth being One Hundred.
She is the ninth Numberblock to be same gender as both of their digits after 10, 11, 15, 16, 22, 29, 30, and 42.
She is the first Numberblock to speak with an American accent.
She is the third smallest Numberblock greater than Thirty to have circular eyes, after Thirty-Five, and Thirty-One.