Garnet, who’s a fusion of Ruby and Sapphire, is the leader of the Crystal Gems in Steven Universe and is often the the peacemaker between Pearl and Amethyst. For her costume, the gloves are going to require painting and bedazzling, and her leotard will also need alterations. The styrofoam ball will help to create the exaggerated puff sleeve look once they are shaped to your arm and covered in fabric.
In Steven Universe, Ruby is Crystal Gem who has the ability to fuse with Sapphire to form Garnet. As her appearance suggests, she has a fiery, short temper which can literally turn her into a hot-head.