My name is A and I am the main character of a video game!
Please do not mistake my name for the one of my friend B like so many have done before!
I saved B multiple times but B simply won't stop getting in trouble!
When it gets dark I sometimes change shape.
Do not underestimate me because I sometimes look young for looks can be deceiving and I have many looks I can use to deceive you!
As long as I have my sword and my courage, I swear on my name that I shall unify us all!
The famous actor CD liked my game so much that he used B's name!
CD once played the character called FG in a movie.
FG, CE and me might look very similar, but the 3 of us are not related!
Please find the following names!
Please also explain your reasoning for every clues given.