So many great games. Start with these:
The Legend of Zelda: Ocarina of Time 3D
Fire Emblem: Awakening
The Legend of Zelda: A Link Between Worlds
Shovel Knight
Super Mario 3D Land
The Legend of Zelda: Majora's Mask 3D
Fire Emblem Fates: Special Edition
Pokemon X/Y
Pokemon Sun/Moon
Monster Hunter 4 Ultimate
SteamWorld Heist
Luigi's Mansion: Dark Moon
Xenoblade Chronicles 3D
Monster Hunter Generations
Metroid: Samus Returns
Super Smash Bros.
Donkey Kong Country Returns 3D
I also really enjoy playing all the old Zelda games on the Virtual Console (Minish Cap, both Oracle games, Link's Awakening, A Link to the Past).