The one people least expected
The President of China Xi Jinping
To be sincere with you, I don't give an "F" what China thinks of Bitcoin. That country lost my respect in this industry when she banned Bitcoin in 2017 or so and many miners and exchanges had to forcefully leave China. That action caused a lot of panic.
Honestly, I would be more interested and bullish on Bitcoin (if I hadn't been till now) if characters like Elon Musk or Warren Buffet makes any bullish statement on Bitcoin than I would if China did.