The series's hero and the biological son of Renton Thurston and Eureka, technically making him Ao Thurston .
His mother one day fell from a clear sky into a bay in Iwato Jima, before giving birth to Ao sometime later, who ended up in the care of his mother's only friend Toshio Fukai. Ao discovers the "RA272 Nirvash Mark One" after he unintentionally retrieves his mother's bracelet in the midst of a smuggle operation.
Ostracized by the villagers and targeted by the armies of several countries, Ao decides to join "Team Pied Piper", hoping to find her.

Source:Wikipedia

This is how Sasuke looks in the Naruto Shippuden Series.

When designing Sasuke in his Part II appearance, Kishimoto's (mangaka) main objective was to make him look cool. For this, he tried giving him several outfits such as a 'tsuna' around him to preserve Orochimaru's style of clothing; as by the moment in the series Sasuke was his apprentice.

Source:Wikipedia

This is how Sakura appears in the Naruto Shippuden Series.

Haruno Sakura(春野 サクラ) is the sole female member of Team 7, along with Naruto and Sasuke.

Source:Wikipedia

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Uzumaki Naruto(うずまき ナルト) is the primary protagonist of the Naruto series and the first character created by Kishimoto during the conception of the series. In the story, Naruto has ambitions of becoming Hokage, the leader of Konohagakure. But because he is the host of Kurama, the nine-tailed fox that attacked Konoha, he is ostracized by the other villagers. He compensates for this with his cheerful and boisterous personality, and over the course of the series, manages to befriend many foreign and Konoha ninjas. He develops an especially close relationship with Sasuke Uchiha and deep caring affection for Sakura Haruno, two of his fellow ninja in Team 7.

Some read up about Naruto's design:
Kishimoto was satisfied that he gave his character blond hair and blue eyes, something rarely seen in Japanese. Therefore Naruto, along with the immense popularity the series has gained, comes naturally to the readers and international audiences with blond hair and blue eyes. Moreover, the editor of the American magazine Shonen Jump implied that these traits may have made the characters more appealing to Western audiences.

Naruto's wardrobe is based on clothing that Kishimoto (mangaka) wore when he was younger. According to Kishimoto, a pre-existing design would not have made Naruto unique, whereas something original would have made him too distinctive. Because Naruto is associated with spirals in terms of objects he uses, the designer incorporated swirl patterns into the costume. Initial illustrations depicted Naruto in boots, but Kishimoto replaced these with sandals, because he enjoys drawing toes. The goggles that Naruto used to wear were replaced with a hitai-ite, or shinobi headband, because they were too time-consuming to draw. One of the most difficult design choices was the color palette of Naruto's outfit. The orange in his costume makes Naruto "pop" and the blue parts are often used as complements.

In the original Japanese versions of Naruto, Naruto often ends his sentences with the addendum "-ttebayo" (which achieves an effect similar to ending a sentence with "you know?" in English). Kishimoto wanted to give Naruto a childlike catchphrase, and "dattebayo" came to mind; the creator believed that the phrase complements Naruto's character, and serves as a verbal tic that portrays him in a brat-ish manner.

Kishimoto most identifies with Naruto of all of the series' characters.

Source:Wikipedia

This is how Naruto appears in the sequel; 'Naruto Shippuden' Series.
When designing Naruto for his Part II appearance, Kishimoto drew Naruto's forehead-protector wider to make his eyebrows easier to draw, something that had bothered him in his previous design. He also noted that Naruto's pants made the character look too childish. To remedy this, Kishimoto designed Naruto's pants to roll up, giving him a more mature appearance.

Source:Wikipedia