I looked up web definitions but they tend to confuse me. So what I don't get: What are the differences between (Static and Dynamic), (Flat and Round),(antagonist or protagonist). I am suppose to define characters from a story..but they all sound the same to me. Ugh I am so confused please help me out, thank you.

I'm not sure I see the use in putting literary characters into neat little categories but...

A static character is one that doesn't change during a story. Superman would be a static character because his personality and understanding are always the same; he doesn't learn, or see things differently, as the story goes on. A dynamic character is one whose personality changes - gaining understanding and insight - over the course of the story. Imagine an unassertive wimp who became braver and braver until he was performing feats like Superman does daily, but then realised that beating people up and throwing trains around doesn't really solve problems and so eventually became a social worker... that would be a dynamic character.

A flat character is pretty much like a static character - but I guess this term emphasises how unrealistic a static character is. Superman has a very limited range of emotions - he's not a real person. A round character is more realistic - a regular, contradictory, confused and confusing person with a full range of emotions, anxieties, desires, needs, roles and so on, who will act differently in different contexts.

So, Superman is a flat, static character - unrealistically simple and always the same. A round, dynamic character would be more like real person - with many different characteristics and able to change (and I don't mean in a phone booth).

The protagonist is the hero of the story, the main character (Superman, again - even though he's flat and static). That antagonist is whoever the protagonist must struggle against (The Joker - also a flat and static character). "Antagonist" simply means competitor, opponent or rival. "Protagonist" simply means, in Greek, something like First Actor - the star. I guess these two terms could get confusing in a work where the star is the bad guy - like Training Day.