Often seen at the wheel of one of his supercars, Thai ultraroyalist Tanat "Nat" Thanakitamnuay became a well-known face at demonstrations that ushered in Thailand's 2014 coup.

Now he is back on the streets demanding both the removal of coup leader Prayut Chan-ocha as prime minister and reforms to the monarchy — a change of heart that points to the broadening of Thailand's latest anti-government movement.

"It's bad for your mental health to see an incompetent PM," said Nat, 29, who was blinded permanently in his right eye last month after being hit by a teargas canister at a protest.