B is the second letter of the Alphablocks gang. She is also D's younger sister, who plays the bass guitar.
She is a pale blue block with an orange star on her right eye.
She is light grey and her star is red.
- (to her brother D) "Brother, we can barely hear ourselves play!"
- "Show us what's behind your back."
- "Bother! I can't sleep."
- "Bit late!"
- "Hello. What's a boy?"
Out of all the blue Alphablocks, she is has the lightest blue body.
Her letter means 11 in Hexadecimal.