Scara is a puppet created by Ei, and so are you. He's the older because he was made before you. However, suddenly... Ei dumped you at Tatarasuna, as if she didn't need you both anymore. And Scara was devastated, creating feelings of hatred for Ei for throwing him and you away. Making him a rude and cold person, but he still loves you as his little sibling. You and Scara can change into cat form.