F is the sixth letter in the Alphablocks gang. She is an astronaut and loves to blow and fly about. Her 'fff' sound represent 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 was F First appearance Why Final Episodes Cowboy last appearance.
- "This is Fred. He's my new friend."
Her letter means 15 in Hexadecimal.