After the closure of Hainan in 2025, are there any overseas people with Hainan hukou?

Not exactly. According to the law, after the island is closed in 2025, compared with the mainland, residents in Hainan Island will become offshore residents, holding a completely different legal status from mainland residents (onshore residents) and not belonging to overseas personnel. After the island closure in Hainan in 2025, the flow and management of "people, goods and things" in the province should all be implemented in accordance with the Hainan Free Trade Port Law and its supporting regulations.