So, just thought I'd point out a G-rated TF in Steven Universe - with process!
I admit, I'm growing kind of fond of the show.
Just for some contextual background, the monsters are all former "Gems" (an all-female alien race consisting of a rock and a projected physical form). Most of the Gems on earth were corrupted by a superweapon and turned into their current forms. Individual Gems can fuse together to create a single being, and it seems like Jasper (the main villain from the last few episodes) became corrupted after fusing with a corrupted Gem.
The full episode is here:
Part 1:
https://www.youtube.com/watch?v=DxWw7aA3Yts
Part 2:
https://www.youtube.com/watch?v=YIyJMmgyw0M
Part 3:
https://www.youtube.com/watch?v=5_UoF9Y9rDc
The TF starts in Part 2, here:
https://www.youtube.com/watch?v=YIyJMmgyw0M&t=3m30s and continues into Part 3.