D'Artagnan is still a teenager when he leaves his native Gascogne "to go up" to Paris. In the series, he is just 15 years old and he dreams to become a musketeer. He is far from knowing the difficulties he will encounter and the very important missions which will be given to him thereafter. even if he is still impetuous and inexperienced, courage and a strong will help him to achieve his goal. A great sense of honor is also one of his qualities. He is weak against women - the disconcerting Milady or the soft Constance with whom he is very in love. (Source: souslesigne.free.fr)
Kino is the lead character in the story and is described as being around 15 years old with short black hair, large eyes and a fearless face. Kino usually wears a black jacket, brown overcoat, white shirt, goggled cap and wide belt with lots of pouches—using special gear depending on the weather or season as necessary. Kino travels with the motorrad, Hermes. The two have a contract—Kino provides the balance, Hermes provides the speed, and together they can travel anywhere they wish. Kino is an excellent marksman with deadly speed and accuracy, and is typically armed with two large-caliber pistols. On the journeys with Hermes, they both try and stay neutral to the situations they come across and avoid getting into other people's business. It is revealed in episode 4 of the anime and the final chapter of volume 1 of the light novel series that Kino is a female. Her name "Kino" is actually the name of the traveler who saved her as a child and caused her to take to her current lifestyle. Her actual birth name is left unstated throughout both the show and LN but there are implications in the anime that it is "Sakura."
Athos is in a way the head of the famous "three musketeers". At 28 years old, he is the oldest of the group. Calm and considered, he handles the sword with great accuracy. He's the wisest of them all.
Each time there is a brawl, he is the first to want to pit himself against the adversary. But his biggest interest is certainly to do feasts with his comrades. This does not prevent him from being kind-hearted and courageous.
The commander of the Astarian army.His grandfather was killed in the Battle of Moss Mountain by a Kim-un-kur with a bear + anima.Because of this he hates all Kim-un-kur and + anima.He is childhood friends with the researcher Fly.He feels that all + anima have the blood of the Kim-un-kur in them and would like to get rid of them.He is very patriotic and will do anything for Astaria.
The Fire Daimy� has a fickle and indecisive nature and is easily swayed in his decisions through biases as well as external influences. When situations call for fast, important decisions, he makes his advisers do the whole work: the one who convinces him most is the "winner". He seemingly had a liking for Jiraiya, wanting to choose him as the next Hokage, and was also impressed by Kakashi Hatake's reputation. (Source: Naruto.wikia)