Saizou is a hippo, held at Namimori Animal Park. Reborn made friends with Saizou when Tsuna and Kyoko were on their date. Saizou was first seen when Tsuna and the others gathered together when the lions were let loose.
- It is odd that the hippo is called Saizou, since "Sai" is rhinoceros and "Zou" is elephant in Japanese.
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