Hello you,
well, I can ensure you that this two are Sora and KAIRI! These other suspicions must be from some perverted ones. Besides, Sora and Kairi drawed those pictures and I don`t think Kairi would draw Rikku after all. I`ve seen the ending enough times to tell you:There is nothing between Kairi and Sora. So: don`t worry, be happy... lenne_