No final bosses, that's for another time.

Basically all of the boss fights from no straight roads...except 1010's cause I like the music in them

Probably the one in lego avengers

Assassin's Creed 2.
Hunting the Pope.

Wind blight ganon

Galleom from SSBU
The fire vellumental from PM:TOK
Whispy Woods from Kirby Star Allies

Either DJ Grooves from A Hat In Time or 8-Hearts from No More Heroes

The two ganon form fights before demise in skyward sword

Squashini from Kirby's epic yarn

and Colored Pencils from Paper Mario Origami King

And every single Meta knight battle

The King Pig.
Unlike all the other bosses, King Pig can get destroyed by the birds

Like, you mean the one from angry birds 2? That's the only king pig boss fight I can think of.

That and original angry birds

Any browser boss fight in mario is fun

Cube from jsab, and also sisters of battle from hollow knight