From the Super Mario Wiki
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“Say... Have you ever noticed all the pipes everywhere? Do you think they're part of some complex sewer system? That's gross... No, the pipes must carry something super important, like Shroom Shake! Maybe it's some kind of direct Shroom Shake pipeline to major cities! Yes! Shroom Shakes... For all!”
Bozzo is the grandson of Watchitt living in Yold Town during Super Paper Mario. This little boy is full of energy and is always curious. He often finds himself in sorts of mishaps. Tippi says that because he is Watchitt's grandson, Bozzo may become mayor someday.