Kaoru Kaidoh

Kaidoh is nicknamed "the sniper" by his fellow teammates since he is always really serious and is easily irritable. Kaidoh's famous move is the "boomrang snake" which makes the tennis ball go around the pole and back into the court. Kaidoh trains extremely hard, most of the time under Inui's instructions in order to improve his tennis skills. (additional note: he lost to Echizen in the first Seigaku regular selection matches, but he was able to save his regular's position after defeating Inui)

Takeshi Momoshiro

Momoshiro Takeshi perfers to be called "Momo-Chan" (chan is a suffix used on Japanese names, usually refers to a really close friend or a kid) Momo is the power house of Seigaku, he plays really powerful balls and his "dunk smash" is beyond regular Junior high tennis level. Momo-chan is also the first Seigaku player to meet the star of the show: Echizen Ryoma, afterwards, the two behind good friends.

Takashi Kawamura

Kawamura's special feature is that he's in fact a really timid person who changes drastically when he's playing tennis. Kawamura used to tennis and often plays doubles with Fuji in the games.

Sadaharu Inui

The brain behind Seigaku's team. He takes data for all the games, including personal data for his rivals along with teammates. He's formerly known as Seigaku number 3 (right behind Fuji and Tezuka) - the data tennis man. But due to losing the Seigaku's regular selection matches in the beginning of the series (mostly because of Ryoma's appearance), he played Seigaku's manager for the first 50 or so episodes.

Eiji Kikumaru

Eiji is perhaps the most popular character in this anime. He's well known for his acrobatic play, together with Oishi, they are known as Seigaku's golden pair. Eiji has a big teddy bear at home and when it falls, it's always towards left. Eiji was able to use this as a game strategy with Oishi in one game. Eiji has a terrific personality although he loves to tease others as well, this got Oishi, who is a really sensitive person really mad in one occasion and caused the biggest crisis of Seigaku - the breaking up of the golden pair.

Shusuke Fuji

Fuji is known as a tennis tensai (genius). He's extremely famous among all the tennis players in the region. Fuji's skill is right behind Tezuka's. He also has a brother who goes to a different tennis school, mainly because he didn't want to be compared to his big brother - Fuji, who's already known as the tensai player at Seigaku. Fuji is always smiling no matter in what situation, this gives him a really friendly appearance, although in fact, Fuji is a deadly strong tennis player that most Junior high players should pray to never meet in the court.

Shūichirō Ōishi

Oishi is a really kind person who cares about all the other team members twice as much as a regular team member (according to Fuji). Oishi is a Tezuka's close friend and is the vice captain of Seigaku. He plays doubles with Eiji, together, the two of them are known as the undefeated golden pair who went to the nationals.

Golden Pair

Oishi, as a doubles partner he is the perfect complement for the acrobatic Eiji. Oishi is a doubles specialist and is perhaps one of the best doubles players in the series.

Tezuka Kunimitsu

Tezuka is the captain of Seigaku. He's well respected by all the teammates and also by the players in other top tennis schools. Tezuka also made it into the regulars as a freshmen, now he's in his third year and is about to graduate. Tezuka sees great potential in Echizen and taught Echizen the meaning of playing tennis by having a match with Echizen despite his arm injury. Even though Tezuka never smiles, he appears to be extremely popular among the female fans.

Ryoma Echizen

Echizen is the featured tennis player in the show. His father is a famous professional tennis player who retired really early but otherwise could have became the number 1 tennis player in the world. Echizen is the only 1st year regular player in Seigaku, since he short compared to the other members, he's been nicknamed O'Chibi (baby boy) by fellow player, Eiji. Additional info worth noting: Echizen grew up in United States and knows English very well (many classmates admires him for this).

Sumire Ryuzaki (竜崎 スミレ Ryūzaki Sumire) is the coach of Seigaku's tennis club, as well as one of the school's math teachers. She is the grandmother of Sakuno.

I'm interested in Japanese cartoon and I think The prince of tennis is the one that you should watch !