4. On Jupiter: You Would Be a Floating Being of Gas
Jupiter has no solid surface, so you would float through thick clouds of hydrogen and helium. Your body would be compact and muscular to withstand pressure, with internal gas pockets to help you stay aloft.
Your skin would darken to protect against radiation. Since there is no oxygen, you would need artificial systems to breathe or evolve in an entirely new way that does not rely on oxygen at all.