Naruto is noted as boisterous, exuberant, and unorthodox, quite similar to Hashirama Senju.[ He inherited his mother's verbal tic, when emotional. Though he responds best to competition and is not afraid to ask for assistance, Naruto is relatively naïve and slow to understand principles or situations. He often requires an oversimplified analogy in order to grasp explanations[ and can even prove forgetful.
Kurosaki Ichigo is a multi-faceted being who is defined by much more than a singular shonen-style goal or a big appetite. He was a cheerful and outgoing child until his mother Masaki's tragic death, which had a profound impact on him. Ever since then, Ichigo has been a more withdrawn and defensive person, only allowing a few trusted and cherished friends into his life while maintaining a strong independent streak. He's warm-hearted and makes his own rules, marking him as an ISFP, the Adventurer of the MBTI chart.
Eren is not generic, he's special, since the day he was born. From an angry and whiny wimp who cried for his mother's death, he developed into a mature person who knows how the world evolves around him.
He is a smart shounen anime protagonist unlike most other shounen protagonist. What I like about him in both FMA series is how he would sacrifice everything just to get bhis brother's body back. In FMA03 one of the most emotional scene is when Ed sacrifice himself to get his brother back but in expense of him going to the other side of the gate, probably wouldn't meet his brother again. But, that scene is really heart-breaking because at the end we never see a happy ending with two brothers meeting each other again with their wish became granted.
Luffy's personality can be described as childlike, in the sense that he tends to go to the extremes. He can either be extremely greedy, especially in cases of food, who his crew is, and adventure; or extraordinarily selfless, going so far as to virtually sacrifice himself to avenge or protect his friends, crew, and family