X is the 24th letter in the Alphablock gang.
X is a yellow and blue Alphablock. He wears a black mask, a red cape, and white gloves and boots.
Alter Ego Edit
His alter ego, Plusman, can make compound words. In Plusman's appearance his body is red and orange.
X's letter means 10 in Roman Numerals.
He is one of the 7 Alphablocks whose lowercase letters above their head are shaped like their capital form. The others are C, O, S, V, W, and Z.