Sakura Kushina nothing alike? Are you actually kidding me?
Sakura is more like Kushina than Hinata is.
Sakura is a short tempered as is Kushina. They are both competitive and both lash out on the closest victim when their duse is cut short by either an insulting action or comments.
Kushina and Sakura are two completely different characters with similar backgrounds. I have seen some similarities with Kushina and Hinata but not personallity wise.
Both Kushina and Sakura were bullied. Kushina was picked on for her red hair and 'tomato face' and Sakura with her 'large forehead'. Hinata was not bullied, despite what happend in the anime, we did not see such scenes in the manga. We don't know if Hinata was bullied or not as it hasn't said in the manga, if it has I haven't seen it.
Alot of people say that Hinata is a lot like Kushina because she risked her life for Naruto. Remember Kushina NEVER risked her life for Minato. So that blows that reason clean out of the water :/
Kushina never believed in Minato, she believed he was 'weak' and unreliable.
Sakura found Naruto annoying and didn't like him in part one. Sakura always refered Naruto as annoying and that he didn't understand anything about her.
There are many similarities between Sakura and Kushina, people just try and convince them selves that they are not. Or they say "Kushina was useful Sakura was not" And Hinata is

? Please Hinata does jack shit in all, like most females in the series. Sakura is a medical ninja, last time I checked medical ninjas are like doctors. Are doctors useless too -__-?