The first boss becomes a regular enemy half way through the game

>main character from the first game is the final boss in the sequel

It's to teach you the importance of learning attack animations and patterns.

undertale
which is another way to say cave story of course

pinpon

>First ennemy in the game becomes final boss

>final boss summons ghost versions of the rest of the games bosses

>Boss slices and dices while also carving up a mean dish

>Final boss has movesets of all other bosses

>boss was just trying to keep the world safe from an even greater evil

>first boss becomes your friend for the rest of the game