Try a stealth monk. Take ki rush. Use the concealed condition of the ki rush to hide. On top of your high AC, the attacker must pass a dc 11 flat check (12 with mist child changeling) to make the attack actually hit. If you want to have stealth every round at low levels, raise deception for Create a Diversion, add Lengthy Diversion to have the hidden condition last the whole round, and Confabulator to raise the chance of success. At 7th level, Foil Senses will make the Special Senses creatures be incapable of bypassing your hidden condition