One Hundred (100) is a square Numberblock. It's known that he/she has 100 blocks.
Prototype designs
Gabe Sotillo's design of One-Hundred is white like Ten, but with a double-border - red and dark red - red lips and legs, dark red arms, ten stars (10x10) on each red glove in the colors of Numberblocks 1-10, ten decagram eyes (10x10) of the same colors, and four pentaicosagram buttons of the same colors (25x4). She is a mix of the Numberblocks
Arifmetix's design of One-Hundred is white with red borders like Ten, but she's square with ten stars (10x10) on each glove colored in the Numberblocks 1-20, She is a mix of the Numberblocks 1-10. She is called a big 100-block.
SuperToysUniverse’s design of One Hundred is golden, used making Clay.
Stikbot1992's design is white on the inside, two outlines, one red and one white, with ten stars a glove.