Han seems completely bugged in this. His description says “takes a bonus turn” not “starts with 100% turn meter” so he should go before the preloaded TM enemies. He doesn’t. When it finally gets to his turn he can use all his abilities, not just his basic. His basic doesn’t stun, and he doesn’t have the normal amount of TM he does after his special first turn.
Sorry if this has been discussed before; searching here is not easy, especially on mobile.