Lapis Lazuli from Steven Universe is pro-choice. She was forced into a fusion by Jasper and was abused by her, and knows what it's like to be pressured into making a choice you don't want. She supports abortions and freedom for women.
Steven from Steven Universe is pro-choice. He helps to protect everyone on Earth and their rights, including their bodily autonomy. Also, since his mom had to give up her life to have him, he understands that sometimes abortions are necessary.
Garnet from Steven Universe is pro choice! While she doesn't completely understand human pregnancy, she does understand bodily autonomy. Being fused is very important to her, but not everyone feels the same way, and the idea of forcing two people to fuse distresses her to the point of making her sick, everyone should get to decide what happened to their body, and if they don't want to carry a pregnancy they shouldn't be made to.