For Naruto he is similar to Goku; because they are both the main character, they are both goofy, clueless, they never give up, and they’re always the one to save the day when its really needed. They are both orphans, both survivors of a once-mighty group that got destroyed (Uzumaki/Saiyans). They have both been trained by a world-famous super-strong pervert XD lols (Jiraiya/Master Roshi). They both learned their masters trademark attacks (Rasengan/Kamehameha). They both have a secret animalistic ability that gets mastered (Kyuubi/Oozaru (Giant Ape), Goku tamed the Golden Oozaru to become SSJ4). They both got a golden-colored super mode later on (Kyuubi/SSJ). They both makes or tries making friends with their enemies (Sasuke, made Zabuza cry, Haku, made Pain revive people, made Gaara his actual friend, and also became friends with Neji/ Goku made friends with his enemies too (Vegeta, Piccolo, Tien, Krillen, Yamcha, Buu). They always see / tries to see the good in people (even their enemies).
For Sasuke he is very similar to Vegeta; because they are both the secondary main character (Vegeta becomes one later in DBZ). They are both arrogant, spooky, have an evil aura, they are both easy to get annoyed. They are both an avenger of their destroyed race / clan (Uchiha/Saiyan). They were both misguided about who actually killed them (Sasuke was led to be believe his whole life that Itachi was responsible for the massacre when it was really Danzo behind it with Obito’s help / Vegeta initially thought it was an asteroid that destroyed Planet Vegeta when it was really Frieza who blew up his home planet); but both then hated and avenged or tried avenging the true villain (killed Danzo, then came to avenge Itachi / tried killing Frieza but was not successful). They both pretended to be under some villain’s rule, only to betray him later on (killed Orochimaru/only joined Babidi for power to fight Goku, but tried killing Buu later on). They are the main guy’s enemy/rival/friend in either order (both ended up as rivals & friends so far). They are both very jealous of the main character (Naruto/Goku) in terms of strength and power (Sasuke became jealous of Naruto when he told Sakura it was not him who saved her but Naruto, and seeing her smile at Naruto caused anger and jealousy burning inside him; almost as if he wanted to be the one to save Sakura XD / Vegeta is jealous of Goku, because he was the lone survivor of the Saiyan race, is the Prince of all Saiyans, and seeing Goku transform to SSJ also caused anger and jealousy burning inside him, when he wanted to be an SSJ and struggled, while to him it seemed Goku had no problems transforming. They both redeemed themselves from their evil ways (Sasuke’s journey to redemption & his current mission with the Boruto movie / Vegeta’s sacrifice with Buu). They are both shown to have a softer side with the people they care about (Sakura & Sarada / Bulma, Trunks & Bra (Bulla) even Goku to an extent since Goku besides himself is the only true full blooded Saiyan left).
For Sakura she is similar to Bulma because; they are both the female main character (Bulma was in DB, but became more of a supportive role in DBZ /GT). They are both officially book-smart (best student / outright genius). THey are both noisy, brash, far from being polite, and has a “normal” family. They are both weak fighters (until Sakura surpassed Tsunade and became the strongest woman :D / Bulma was never a fighter, but she was behind the technology ex; Dragon Radar, Time Machine, the Gravity Chambers). They both fell in love with the main guy’s rival (initially fell for Sasuke/eventually some time after Vegeta was introduced). They both kept loving him despite being an enemy (still shows signs of loving Sasuke/fell in love when Vegeta was still untrustworthy). They both never fell in love with the main character (Naruto/Goku). They both have a brother / sister type relationship to the main guy (Naruto/Goku). They both ACTUALLY marry the guy that they have fallen in love with and both have their own families (Sasuke & Sarada/Vegeta, Trunks, and later on Bra (Bulla).
For Hinata she is also similar to ChiChi; because they are both the major secondary female character (has equal importance to Bulma in DBZ, both becoming rather secondary). They are both very polite, shy (young ChiChi is). They are both a princess of sorts (a clan heir/ literally, Ox King’s daughter). They are both a somewhat of a good fighter (at least trained in Juuken, which is a strong style / managed to actually fight Goku in DB; but thanks to Android 18 & Videl, she is the third strongest woman, but can’t fight side-by-side with Goku anymore). They both have a childhood crush on the main guy, which he’s oblivious to (same for both lols). They both confessed their feelings during an important arc/event (Hinata confessed during the Pain fight/ChiChi confessed during a tournament involving Piccolo where she thought Goku would die). They both ACTUALLY marry the main guy and has their own family XD (Naruto, Boruto & Himuwari/Goku, Gohan & Goten).
Thoughts? Opinions? Edited version.