Riku has brown hair and brown/black eyes and seems to be a bit taller than his two older sisters.
- Hana Matsuzaki (grandmother)
- Ryoko Matsuzaki (mother)
- Yūichirō Sawamura (father)
- Umi Matsuzaki (older sister)
- Sora Matsuzaki (older sister)
- In the original manga his surname is Komatsuzaki (小松崎).
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