Happy Rapunzel is a Premium Box Tsum. She was introduced to the Japanese version in tandem with the Story Book Lands event (June 2017). When she was first introduced in the Japanese version only, she would be a musical Tsum, and play the song, "I See the Light" during gameplay. She was introduced in the International version during the Disney Storybooks event (April 2018).
Happy Rapunzel connects different Tsums together and clears surrounding Tsums. Her base number required is 15 and her base chain size is 6. Higher skill levels reduce the number required.
Connecting large Tsums only count as 1 within the chain and result in much larger clear areas.