3rd Person Action Stealth
Metal Gear Solid (my favorite), Metal Gear Solid 2: Sons of Liberty, Metal Gear Solid 3: Snake Eater, Metal Gear Solid 4: Guns of the Patriots, Metal Gear Solid 5: The Phantom Pain
Splinter Cell, Splinter Cell: Pandora Tomorrow, Splinter Cell: Chaos Theory
Tenchu: Stealth Assassins, Tenchu 2: Birth of the Stealth Assassins
Metal Gear Solid (1998) is my favorite game of all time and it was a significant change in the gaming landscape in 1998. Not only a stealth action game but an incredibly cinematic game that opened the door for a different expression of storytelling in gaming. I know the other entries expanded and improved on it and are probably better games but it pioneered a lot of what we see in gaming today. I just love it.