Why does Naruto have a catch phrase? In both the anime and manga Naruto often ends his sentences with either "dattebayo" or "believe it" in the English translations. 

Why is this a thing?

Is it meant to further his character or provide a bit of remembrance of his character to the reader or viewer, or even other characters of the series?
In chapter 498 of the manga, it is mentioned that Naruto inherited this habit from his mother, Kushina, who would instead end her sentences with "(Da)-ttebane" ([だ]ってばね) when she got excited or angry. She also mentioned something along the lines of hoping that her son wouldn't inherit this habit.