In aqueous, Solutions at room temperature, poly(N-methyl-2-vinyl pyridinium iodide)-block-poly(ethylene oxide), P2MVP(38)-b-PEO211 and poly(acrylic acid)-block-poly(isopropyl acrylamide), PAA(55)-b-PNIPAAm(88) spontaneously coassemble into micelles, consisting of a mixed P2MVP/PAA polyelectrolyte core and a PEO/PNIPAAm corona. These so-called complex coacervate core micelles (C3Ms), also known as polyion complex (PIC) micelles, block ionomer complexes (BIC), and interpolyelectrolyte complexes (IPEC), respond to changes in solution pH and ionic strength as their micellization is electrostatically driven. Furthermore, the PNIPAAm segments ensure temperature responsiveness as they exhibit lower critical solution temperature (LCST) behavior. Light scattering, two-dimensional H-1 NMR nuclear Overhauser effect spectrometry, and cryogenic transmission electron microscopy experiments were carried Out to investigate micellar structure and Solution behavior at 1 mM NaNO3, T = 25, and 60 degrees C, that is, below and above the LCST of similar to 32 degrees C. At T = 25 degrees C, C3Ms were observed for 7 < pH < 12 and NaNO3 concentrations below similar to 105 mM. The PEO and PNTPAAm chains appear to be (randomly) mixed within the micellar corona. At T = 60 degrees C, onion-like complexes are formed, consisting of a PNIPAAm inner core, a mixed P2MVP/PAA complex coacervate shell, and a PEO corona.