The plot of Steven Universe, as gleaned from my Tumblr dash:

Pink gem lady comes to Earth and falls in love with a human. She gives birth to a half-gem-half-human baby but dies in childbirth. Some more gems come to Earth to raise the child. (They can split into two and fuse into one somehow?) One of them is stuck at the bottom of the ocean. Also there are some evil gems. Wacky and sometimes sad hijinks ensue