Prince of Tennis is about a 12 yr old guy named Echizen Ryoma and is a young pro American-Japanese tennis player who wants to come first in the world of tennis and defeat his dad, Echizen Nanjiro, a former top-tennis pro who mysteriously retired from it at an early age, and idiotic guy who now likes to look at pervy magazines of girls (ewww, -kicks Nanjiro in the face- ). Echizen goes from America to Japan in Tokyo and there, he attends Seishun Gakuen (青春学園) or it's nickname Seigaku (青学) and attends the tennis club in there to defeat various players. The characters of this series are: Ryoma Echizen (越前リョーマ) main character of the series, Tezuka Kunimitsu (国光手塚), Captain of Seigaku Tennis Club, Shuichiro Oishi (秀一郎大石) Vice-President, Syusuke (Shusuke) Fuji (不二周助) the "Genius" of the club, Kikumaru Eiji (菊丸英二) forms the "Golden Pair of Seigaku" with Oishi, Takashi Kawamura (河村 隆) uses the "Hadokyuu" a dangerous serve that can break one's wrist, Sadaharu Inui (乾 貞治) uses Data Tennis, Takeshi Momoshiro (桃城 武) uses the Dunk Smash and Kaidoh Kaoru (海堂 薫) uses the snake. You'll get it when u watch it.

Generally, I think the film is really good, but I LOVE FUJI SYUSUKE THE BEST!!! He's mine girls, and take him away from me, I'll strangle you =.=. WATCH IT.
If u wanna noe more info, go here:
http://en.wikipedia.org/wiki/List_of_The_Prince_of_Tennis_characters it'll tell u everything