Riku Sohma is the younger twin brother of Sora Sohma and is a classmate of Sawa Mitoma. Along with his sister and Sawa, he also attends school with his relatives Mutsuki and Hajima. It is heavily implied, though not confirmed, that Riku and Sora are the children of Hatsuharu and Rin Sohma.
Riku looks very much like his father.
Sora describes him as “neurotic”, “just too serious and blunt” and “a real blockhead”.
Role in the Story
Sora is the older twin sister of Riku.