WARNING!! Keep an eye out for
spoilers! These are thorough reviews so...tread carefully.
Please review the Terms and Conditions before proceeding.
The Main Characters

Echizen Ryoma
The tennis prodigy from the original Prince of Tennis series.

Echizen Ryoga
Ryoma's older brother, who disappeared when Ryoma was still a little kid. He seems to have a fascination for oranges (or stealing them from Ryoma). Ryoma has a low opinion of his brother, and shows this mostly by ignoring him. Ryoga's character in the movie mainly emphasizes the tragedy of having no particular goals to strive for. Meanwhile, he spends his extra time with a shady crowd, playing the role of Captain to the rival tennis team.
He and Ryoma have their first real match on the cruise ship.