Animal Crossing, and it's not even close.
Animal Crossing is one my most beloved game franchises. And it's the only ongoing Nintendo 21st Century IP that has become huge. Wii (Sports, Fit, etc.) and Nintendogs were huge, but they've been dead since after the 3DS and Wii U days. Who knows if they'll ever be revived? Animal Crossing is not Mario, Pokemon or Zelda level. But it's a heck of a lot more relevant to most players and consumers than Kirby, Metroid, or Star Fox.
Xenoblade Chronicles is great, but it's an honorable mention and not the main attraction.
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 122 million (was 105 million, then 115 million) Xbox Series X/S: 38 million (was 60 million, then 67 million, then 57 million. then 48 million. then 40 million)
Switch 2: 120 million (was 116 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima
