Hmm... I can think of a few game series off hand:
-Legend of Zelda (A Link to the Past, Link's Awakening, Ocarina of Time, Majora's Mask, Minish Cap, etc).
-Mario RPG Series (Super Mario RPG, Mario and Luigi: Superstar Saga, Paper Mario 2).
-Mega Man Series (Current avatar and screenname come from this series)
-Donkey Kong Country (Why did they have to discontinue it)
-Star Wars: Dark Forces series (Dark Forces, Jedi Knight, Mysteries of the Sith, Jedi Outcast)
Super Smash Bros classic and SSBM are also very fun to play.
-Legend of Zelda (A Link to the Past, Link's Awakening, Ocarina of Time, Majora's Mask, Minish Cap, etc).
-Mario RPG Series (Super Mario RPG, Mario and Luigi: Superstar Saga, Paper Mario 2).
-Mega Man Series (Current avatar and screenname come from this series)
-Donkey Kong Country (Why did they have to discontinue it)
-Star Wars: Dark Forces series (Dark Forces, Jedi Knight, Mysteries of the Sith, Jedi Outcast)
Super Smash Bros classic and SSBM are also very fun to play.