F is the sixth letter in the Alphablocks gang. She is an astronaut and loves to blow and fly about. Her 'fff' sound represents the sound of her rocket pack attached to her outfit.
F is voiced by Teresa Gallagher.
She is a purple block wearing a white space outfit with an orange visor and a planet motif on the left hand side.
- "Sorry... I forgot!"
- "This is Fred. He's my new friend."
Her letter means 15 in Hexadecimal.