Concerning himself, he has a silent and cool personality. He has the same surname as the middle school 1st Year Echizen, it seems they're related by blood or something.
Ryoga Echizen (越前 リョーガ, Echizen Ryoga) is a high school tennis player not mentioned in The Prince of Tennis, first appearing in The Prince of Tennis - The Two Samurai: The First Game (テニスの王子様 二人のサムライ The First Game,, Tenisu no Ōji-sama Futari no Samurai The First Game), later appearing in an OVA in New York in which Ryoma spots him training.
Nanjirō Echizen brought Ryoga into the Echizen household in America because Ryoga's real mother died of an unknown cause. Ryoga's techniques are copies from Nanjirō Echizen, like Ryoma in the beginning of the series, but his Twist Serve that he learned from Nanjirō also, has the opposite spin so instead of bouncing to the opponent's head, it bounces away.
Afterwards Ryoga had to leave the Echizen household because Nanjirou lost custody over Ryoga and Ryoga's Aunt wanted him to live with them. When he left the Echizen's home, he gave Ryoma an orange with a message written on it saying that they'll meet again once they have become stronger. Later he was hired by the billionaire Sakurafubuki Hikomaro to play tennis for him in his gambling schemes. In the flashbacks, it showed that he was rather close to Ryoma.
At first he said that Ryoma's tennis was awful (which was true when he was about five or so). It was shown that Ryoga's skills were far superior, but as Ryoma continued to improve, Ryoga began spending more time with him. It was revealed that Ryoga's Aunt (on his mother side presumably) won custody of Ryoga. Therefore, he no longer was allowed to live with the Echizens.
In the fourth OVA, Another Story, Ryoga makes another appearance and finally after surprisingly large popularity and then despite never appearing in the manga, Ryoga is brought into the manga by creator Konomi Takeshi in the sequel series New Prince of Tennis.
Ryoga bears a strong resemblance to Ryoma with his hazel eyes (blue eyes in the manga) and black-green hair as they are half-brothers.
Based on his height and muscular build Ryoga might be at least 3-4 years older than Ryoma. Ryoga's key features are his necklace, and his love of oranges. He is almost always shown tossing an orange. Like his younger brother Ryoma, he tends to juggle a tennis ball with his racket while walking. Ryoga is similar in height to the rest of the High Schoolers in that he is rather tall compared to the Middle Schoolers. In the U-17 Camp, Ryoga wears a hoodie under his uniform, with his jacket completely unzipped, and has his trademark necklace.
Ryoga has similar personality traits like Ryoma. He too is cocky and arrogant, but overcomes it by his dedication to tennis. He uses a similar catchphrase as Ryoma and Nanjiro, which is "Mada mada dane," his is "Mada mada daze."
Ryoga is shown to be like a big brother to Ryoma even though they are not blood related. He shows some protectiveness over Ryoma. Two instances include when he saved Ryoma from a group of thugs that tried to harm Ryoma when he was not paying attention to them (in the US - OVA only) and in the manga where he easily returned a serve from Byōdōin Hōō in the U-17 camp. The reason for his disappearance is still unknown during the movie.
In the movie, The Prince of Tennis - The Two Samurai: The First Game, it is shown that he, like Nanjiro, is a shameless flirt.
Ryoga has a love for oranges and has been shown to even eat them without peeling them. Ryoga is almost always seen with an orange when off the court.
In the manga, Ryoga loves to tease Ryoma about the past. During training where Ryoga teaches Ryoma the Glowing Shot, Ryoga would say, "Saying Onii-san, Onii-san every two seconds. Always sticking to me like glue." However, Ryoma denied this. Ryoga believed that Ryoma used to worship him.
Ryoga first appears in The Prince of Tennis - The Two Samurai: The First Game, which takes place after the Kanto Regional Championship. Ryoga is not mentioned in the main manga or the anime until the sequel series.
Aboard one of Sakurafubuki's cruise ships Ryoga Echizen introduces himself to the team as Ryoma's older brother. Ryoma reveals that Ryoga was "taken in" by Nanjiro many years ago when they lived in America.
Sakurafubuki organizes a match between his hired team and Seigaku since they were the Kanto Region Champions. However the corrupt Sakurafubuki demands the Seigaku players lose on purpose so that he can gain loads of money from the people that bet on the recently crowned Kanto Regional Champions winning against his hired team.
However Ryoga, eventually becomes angered by this as he realizes he wants a serious match with his younger adoptive brother. Despite Sakurafubuki's orders, Echizen Ryoga decides to betray Sakurafubuki in order to play a match against his brother to see who's the better player. While this happens Sakurafubuki holds several Seigaku members hostage forcing Ryoma, who plays in the last match to lose on purpose so his teammates can be freed. However Ryoga decides that he will not be Sakurafubuki's pawn any longer, and fires a tennis ball straight into his forehead. This allows the rest of the team to escape once again. As Ryoma and Ryoga's match continues, a terrible storm brews, forcing everyone on the ship to evacuate through the lifeboats.
The Echizen brothers keep playing their match, even as an enormous tidal wave descends upon the cruise ship. They seem unfazed as they play their match underwater. In the end, thanks to luck, Ryoma is the match's victor when the ball drops onto Ryoga's side of the net, despite that the net is gone and a large light has crashed across the court. Ryoga accepts his defeat and remarks that Ryoma's tennis certainly has improved. The two escape via Ryoga's jet ski, and Ryoma is reunited with his team, who have all escaped the ship unharmed. Ryoga takes Ryoma's hat and gives him an orange and tells him to find his Grand Dream. After Ryoga's chat, he rides his jet ski into the sunset.
Prior To U-17 Camp
Ryoga is shown practicing against a wall in New York that shows his intense level of power as the wall is completely dented. Ryoma is shown watching him during the first episode of the Another Story OVA. This is while Seigaku and Shitenhoji had a joint training camp for two days which was after the Middle School Nationals.
In the ending credits of the OVA, Ryoma returns from Osaka and is seen in a cab in New York, only to see Ryoga outside the window. Ryoma opens the cab door and smiles seeing Ryoga and the song ends with Ryoma on a street tennis court serving a ball, most likely to his brother.
Ryoga's next appearance is in The New Prince of Tennis OVA 1. When Jack tries to aim a ball at his brother's face and Ken was not fast enough to stop it, Ryoga stops Jack's shot with a Twist Serve and also knocks Jack out with the the same serve from a roof above the downtown tennis courts. He and Ryoma stare at each other for a bit, but then Ryoga walks away right before Ryoma receives his invitation to the U-17 Camp. During this time, Ryoga is wearing a black hoodie, the same one that is later seen at the U-17 Camp.
U-17 Camp Revolution
Ryoga's first appearance in the manga and main storyline doesn't occur until New Prince of Tennis within the U-17 Camp.
Upon the arrival of the 1st Stringers, the bus stops outside the entrance of the camp. Representative candidates No. 11-20 head to the outer courts to participate in their Foreign Expedition Group Challenge matches which involves 2nd Stringers challenging them for their spots.
While all this is going on, the Top 10 relax on the 1st Stringers coach bus, revealing Ryoga as a member of the Top 10, though his name was not mentioned until much later. Ryoga appears on the bus wearing a hoodie underneath his uniform, his signature necklace, and tossing an orange which is a known habit of his and also his favorite thing to eat.
Ryoga and the rest of the Top 10 believing that No. 11-20 will easily defeat their challengers, head to the main courts, head on to greet the rest of the members of the camp, where the Coaches declare that they have not met Ryoga before asking who he was. Showing that after meeting Ryoma and escaping the boat on a jet ski in Futari no Samurai he really did go and explore like he said since Byoudouin Houou states that they met him abroad, saw his skill and found out he had Japanese citizenship.
Ryoga and the Top 10 wait at the courts. At this time, Ryoga is still wearing his hoodie, not revealing to Echizen Ryoma who he is. However, he stands with the rest of the Top 10 and lines up against the Top 2nd Stringers wearing his No.4 badge. The coaches notice Ryoga and state that they havent met him before, however Byoudouin explains that they met him abroad.
Ryoga is present at the courts with the rest of the camp upon finding out that the Middle Schoolers defeated No. 11-20 and replaced them as 1st Stringers. After Kimijma Ikuto decides to create a new match rota, later on, Byoudouin sees Tokugawa Kazuya and Ryoma finishing a long practice session. He decides to target them by htting powerful serves, attempting to injure them.
One ball hits Tokugawa and sends him to the floor; however, a serve is suddenly aimed straight at a startled Ryoma's face. Just in time, Ryoga arrives, returning the shot that sent Tokugawa to the floor with ease. He greets them using his childhood nickname for Ryoma, "Long time no see, Chibisuke." He was surprised that Ryoma did not remember the face of his older brother.
Genius 10 Challenge
Ryoga is then seen with the rest of the camp watching the Representative match for spots No.10 and No.9 with the rest of the camp.
When Kintaro and Oni begin their match, Ryoga excuses himself to go to the restroom, racket in hand. Ryoma, seeing this, excuses himself as well and follows him. Ryoga actually makes his way to the restrooms, making Ryoma question his motives, since Ryoma believed that Ryoga wished to play an unofficial match with him. Ryoga notes that there is "someone who wants to play" Ryoma more than him, and Jin Akutsu makes an appearance.
Once it is obvious that Akutsu has no interest in becoming an All Japan Representative and that he only wants to play Ryoma for revenge. Ryoma declines, and Ryoga offers to play with him instead. Akutsu throws what appears to be 10 balls at him, but Ryoga uses his Clone Technique to dodge them all. They begin to play with 10 balls, and Akutsu is shown to hit them all with ease before Ryoga uses Byoudouin Houou's techique to hit a ball with incredible force. The ball has shockwaves powerful enough to wreck the wall of the building behind Akutsu, and likely would have sent him hurling, just as Byoudouin managed to do to Tokugawa, had Ryoma not stepped in. As it was, Ryoma pushed Akutsu aside to take Ryoga's shot, but is unable to fully return it, causing his racket to fall out of his hand. The Echizen brothers are about to engage in a match when Sanada Genichiro appears and berates them for them for their foolishness.
Sanada leaves with Akutsu, leaving the brothers alone; Ryoma takes this opportunity to ask Ryoga to teach him how to hit "that shot" from earlier known as the Super Sweet Spot. Ryoga begins to teach Ryoma the shot. During the practice session, Ryoga teases Ryoma about the past, telling him that Ryoma used to worship Ryoga and stuck to him like glue.
When Ryoma masters the Super Sweet Spot, both brothers return to the court to play each other in round 6 of the Genius 10 challenge. However, since both brothers are too busy talking about their history together that only Ryoga seems to remember, they miss round 6. Therefore, the match between Tokugawa vs Byodoin begin instead.
Playing Style and Techniques
Ryoga Echizen uses a tennis style based off of his adoptive fathers and therefore plays quite a lot like Echizen. He is Right-Handed, an All-Rounder, and is also very skilled since he was given the No.4 badge of the U-17 All-Japan team. He was accepted by the 1st stringers, who are usually very arrogant and confident about their abilities.
Ryoga was also able to easily return the serve of Byoudouin Houou, which shattered the wall around the court on the previous occasion. He can also hit the same shot as Byoudouin, though it's unknown if it is as strong.
The Twist serve(in the movie) is Ryoga's main serve. However, due to a different grip that Ryoga uses, the ball shoots away from the opponent, making it difficult to return. Ryoga uses this serve in the movie.
Ryoga uses this techique when Akutsu attacks him with lots of balls. He uses it to avoid shots or return them easily.
Glowing Shot is a powerful serve used by initially Hōō Byōdōin. It is so powerful it was capable of knocking out Tokugawa and causing a wall behind him to crack. It is shown that Ryoga is capable of using of it, returning it with ease, and taught Ryoma the shot as well.
U-17 Stats 
Stats - No Data: Speed - ?: He's quick enough to instantaneously see through 10 shots hit at him simultaneously and avoid them. However, I believe we've yet to even see half of his true abilities.
Power - ?: Despite his appearance, he can certainly fire off some heavy shots. His physical strength should be considerably high.
Stamina - ?: With his slender and tall build, he seems to have very little to no body fat. His entire body seems to be flexible and springy muscles. His entire body seems almost completely like that of a professional athlete. There is high expectation for him in a real match.
Mental - ?: He has the facial expression of one who is constantly overflowing with self confidence. His mental strength doesn't seem to waver at all from anything. This is possibly from his extended period living abroad.
Technique - ?: Comparable with Byoudouin, it looks like he is endowed with considerable skill. However, his true abilities are currently immeasurable.
Kurobe Memo: This player that Byoudouin brought back with him has many mysterious qualities. Because he is a player that Byoudouin recognizes, it is of no question that he has massive potential behind him.
- Hobbies: Napping and searching for tasty oranges
- Favorite Color: Orange
- Favorite Food: Oranges, Orange Chicken Saute
- Thing he wants most: Racquet
- Thing you're bad at: Rain
- Specialty outside of tennis: Breakdancing, Jet Skiing
- Even though he was abroad, he is bad at English and hates to speak it. Even while in America, he did everything in his power to only speak Japanese.
- Unlike Ryoma, his favorite Fanta is orange flavored.
- It has been revealed that Ryoga's reason for leaving the Echizens was because Ryoga was going to move into his Aunts' place. This implies Ryoga to be either Ryoma's half-brother or cousin since Nanjiroh mentioned they were related by blood.
- Ryoga is the only character in the series to appear in a Movie before his anime and manga appearance. Ryoga first appears in movie The Two Samurai. He then appears in the anime episode The Prince of Naniwa First Act which is an OVA from the Another Story series which takes place just after the Nationals. After this, Ryoga appears in the manga New Prince of Tennis chapter 50. Ryoga then appears in the New Prince of Tennis Special.
- In both the movie and manga, when he meets Ryoma, he has the same reaction and similar wording when Ryoma has forgotten him. He looks slightly shocked and quotes, "Don't tell me you forgot your older brother."
- Ryoga is one of the few tennis players who are capable of hitting 10 tennis balls. 11 balls if you count the orange.
- Despite calling himself Ryoma's older brother, he does not list Ryoma as one of his family members. This maybe because in Japanese and other Asian cultures it is normal to call your cousin or someone you are close to your sibling.
- A very close friend (male or female), who is older by a year or more is typically called nee-chan/san or nii-chan/san, meaning big sister or big brother respectively. However, this title system does not go the other way with when the friend is younger.
- This title system goes both ways when involving cousins and other family members with the younger members being called otouto or imouto, meaning little brother or little sister.