That is so cool. I may have to puzzle out a Superman Chibi for a friend for next year.
What sort of squares did you use for it?
I used a book called 200 crochet blocks for blankets, throws and afghans. It was the beginning two rounds of the pattern "pinstripes". Below is all in US terms.
3ch (counts as 1dc), *[2dc, 1trc] into next dc, [1trc, 2dc] into next dc (corner made)** 1dc into next dr, repeat from * until you arrive at the original 3 ch, join with slip stitch
Then I just sc into all of the dcs in the previous row, with 2sc into every trc.
Hope that made sense!