Currently Online 
Obviously, this thread has plenty of spoilers already. I'll list some games without the boss name, though in case it prevents some people from being spoiled.
In no particular order
Super Mario Galaxy
Super Mario Galaxy 2: One of the parts might seem like a letdown for some but the music is fire.
The Legend of Zelda: Ocarina of Time - Mainly for the first half of the fight.
Fire Emblem: Awakening
Paper Mario
Paper Mario: The Thousand-Year Door
Star Wars: Knights of the Old Republic
Star Wars: Knights of the Old Republic II
Persona 5: Typical final boss probably is worthy but the final boss of the 3rd semester stuff in Royal probably is as well.
Marvel's Spider-Man
EarthBound: Nightmare fuel
Mother 3
Final Fantasy VII
Final Fantasy VII Remake
Ghost of Tsushima
Luigi's Mansion
South Park: The Fractured But Whole: It's a pretty funny fight and still fun.
Lifetime Sales Predictions
Switch: 156 million (was 73, then 96, then 113 million, then 125 million, then 144 million, then 151 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 48 million (was 60 million, then 67 million, then 57 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
