The only thing is I want a boss I like to fight. It don't need to be hard, personally good bosses that stuck with the head are the best. Because the most memorable bosses are the ones that are completely wrong in first place or have a beautiful soundtrack.
Great Mighty Poo (I don't need to explain this, a boss who sings opera)
Pirate Master (Shantae and the Pirate's Curse [End-boss])
HAG1 (Who thought that you fight a machine?)
Wizpig1 (DKR, has awesome music and this boss is hard)
That are only some examples. And pls go away from BT bosses. Every boss is defeated with eggs.
I don't want bosses that are unforgiving like Dark Souls, but bosses without a giant red mark (Here Weakpoint!)
And pls don't refer to bosses where you have to use your move or weapon, that you acquired only.
Good Example is Gruntilda in BK as a boss. You have to use nearly anything you learned the whole game. In BT 50% of moves you learn are not used in the HAG1 fight. HAG1 fight is choosing egg evade everything till you can hit her. Aim, shoot, evade.