While it's not a requirement that someone needs to be big and tall in order to qualify for being a ninja in the Naruto universe, it can still definitely be a big help in combat. Whether the person decides to use their stature to their advantage by adding weight to their punches, or they prefer to take a more defensive style, there have been plenty of incredibly tall characters throughout the story of Naruto who have struck fear into their opponents' eyes with just their size alone.