Cool Big Bro: Six fits the trope moreso than usual. He helps cheer up Three's buddy blocks at the beginning with his own blocks and offers to take Three with him on the mission. At the end of the episode, he offers Three's block another ride with his own blocks.
Damsel in Distress: Nine is trapped by the Puzzler sometime before Six and Three find her.
Good News, Bad News: Five telling Six about being able to solve the puzzle, but he has to turn into two threes. Three herself is actually excited about this.