Final Fantasy IV/Bosses

Normal bosses
Bosses are powerful enemies that you have to overcome. They may either be a single powerful monster, but they sometimes come with escorts.

Optional bosses
Defeating these bosses are not required to complete the game, but makes it easier to do so.

Special Encounters
These fights would appear to be boss fights, but are really special cutscenes. They are mostly there for decoration and are not usually based around the power or abilities of the party.