Poppo is the first of the childhood group that Jinta tracks down. He hasn't changed much since they were kids—still hyperactive, genuinely friendly, and loyal almost to a fault. Jinta's always been his default leader, and that dynamic apparently stuck.
When Jinta finds him in their old clubhouse, Poppo's been living there, funding his lifestyle through whatever part-time work he can pick up. Once he saves enough cash, he takes off traveling around the world. Unsurprisingly, this means he's basically skipped school for years at this point.
Poppo's interests are. let's say unconventional. Jinta immediately noticed the stash of porn magazines scattered around the clubhouse. He's got a pretty open obsession with foreign women, especially Vietnamese girls—fans often note that his whole personality leans heavily into being the group's resident pervert. It's probably the one thing about him that has changed: as a kid he was just goofy; now he's kind of aggressively lewd.
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