I'll limit this to RPGs since this is in the RPG forums. And will weigh in side quests along w/ the main storyline. *checking my list of games good enough to make my top 100* Ok, in no particular order:

Star Wars: Knights of the Old Republic
Dragon Age
Dragon Age: Origins
Dragon Age: Inquisition
Deus Ex
Deus Ex: Human Revolution
Fallout: New Vegas
The Outer Worlds
The Elder Scrolls V: Skyrim
Assassin's Creed: Origins
Xenogears
Chrono Trigger
Chrono Cross
Final Fantasy 4
Final Fantasy 6
Final Fantasy 7
Final Fantasy 8
Final Fantasy 10
Final Fantasy 12
Final Fantasy 14
Final Fantasy Tactics
Nier: Automata
I am Setsuna

note - no hate on other FFs (particularly 9 and 15, which have good stories and characters), just didn't feel their story + characters combined were up w/ the others. Also, have not played any Witcher or Persona games yet! I'd love to list some cRPGs like Divinity Original Sin 2, Pillars of Eternity, Baldurs Gate 1+2, Icewind Dale, etc... but I never played them long enough to see just how good their stories were. Great characters tho! I have also never played any Torment games.