Question: Who is the narrator in the opening scene?
Answer: David Ogden Stiers is the narrator. He is most well known as his role of Major Winchester on M*A*S*H, and has done voice over work for many feature length cartoons in the last decade.
Question: What is the filmmakers's purpose in making Reggie (Freddy Rodriguez, the Guardian) only work out one half of his body? I don't get the symbolism.
Answer: It's not a matter of symbolism, but of making the audience remember who he is. If Reggie was introduced as a normal guy in the beginning, with no significant feature, the audience may not recognize him when he's introduced as the Guardian. The working-out-one-arm thing makes him memorable enough to be instantly recognized again later when necessary.
It is not that it makes him memorable - It is like Mr. Heep says - that he wants to be special. "Every soul has a purpose." Reggie is striving to find his - only it finds him.
Answer: Only that she is running out of time to return to the Blue World.
scwilliam