Hi,
I can't imagine a way that people will ever be able to live 'on' the Sun. The Sun actually is a ball of gas and has no solid surface, so there isn't anything to be 'on'. The temperatures are so much higher than anything we can tolerate (from 11000 to 18 million degrees Fahrenheit), I don't see how we could adapt to that. Perhaps in the far future we could create material that could insulate us from such high temperatures, allowing us to travel to the Sun, but we'd never be able to 'go outside'.
-Christina