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)
The Cardinal of Richelieu is the regent of the kingdom of France. He particularly deals with the collection and the distribution of the finances of the State. He was called by the King Louis XIII who, at the beginning of his reign, was still very young and lacked experience. For this reason Richelieu enjoys a considerable influence at the palace. But it sees it is not enough for him to be only number two of the country. Moreover, he hates Anne of Austria and thus requests Milady to carry out his lowest blows. Rochefort is one of his right-hand men.
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.