This chapter provides a comprehensive overview of the performance and stability of N-G integrated with metals, non-metals, MXenes, and other functional materials. The combination of N-G with transition metals such as iron, cobalt, nickel, and copper leads to the formation of metal nitrogen carbon (M-N-C) coordination structures that enhance catalytic activity, particularly for oxygen reduction and hydrogen evolution reactions, while improving electron transfer and structural stability. Precious metal doped systems further bridge the gap between noble metal catalysts and nonprecious alternatives, though challenges remain in preventing metal leaching and degradation under acidic or oxidative conditions. Non-metal doped composites incorporating boron, sulfur, or phosphorus exploit heteroatom co doping to fine tune the electronic structure and create multiple active sites for catalysis, offering environmentally sustainable alternatives with high chemical stability. Similarly, N-G/MXene hybrids exhibit superior conductivity, mechanical integrity, and interfacial charge transport, though long-term performance is affected by MXene oxidation and interfacial fatigue. Beyond these systems, N-G integrated with frameworks, quantum dots, polymers, oxides, and other materials demonstrates broad applicability in energy storage, catalysis, and sensing. The chapter highlights how interfacial bonding, dopant distribution, and structural compatibility govern the balance between performance and durability. Understanding these relationships provides a foundation for designing next generation N-G based hybrids optimized for long term stability in practical energy and environmental technologies.