A strong stand out character to me was the mysterious masked "Racer X" who serves as "Speed Racer's" guardian angel. Later in the series we learn his true identity. I won't spoil it for you soon to be watchers.
While I have my doubts about the ultimate success of the movie (I don't think it will be taking home all of the Oscars), I do think it has an interesting cast:
So if you're bored in May and looking for something to do - Be sure to check it out.