Let’s look at important things here –
Mars - Mars represents our will power, courage, ability to take actions, aggressive nature, anger, our fighting ability, brother, male friends, a boy friend for a girl, a soldier, an athlete and real estate etc.
Swati - Swati is nakshatra of independence, Justice, Fair-Play and Business People. For more information on Swati Nakshatra, please check this link - https://www.astrosaxena.com/swanaksh.
Libra - As Swati is a part of Libra, Libra sign and its representations also become important. Libra is the 7th sign of Zodiac Belt, hence it represents the energy and things related with 7th house of horoscope, i.e. Market Place, Business, Partnerships, Relations etc. Libra is sign of Balance, i.e. striking the Balance between 2 parties/ideologies or even at personal level between our own dilemmas. It is sign of Peace and Diplomacy. And this is what we are seriously looking for after the conflicts and disagreements of Virgo, i.e. Peace to prevail. At personal level, Libra is seen as sign of Relationships. Libra is consisted of 2 and half Nakshatra named Chitra, Swati and Vishakha. Libra's lord is Venus only.
Rahu - As Rahu rules Swati, Rahu's position and dignity is important to know about the overall functioning of any planet in Swati.
Venus - As Venus rules Libra, Venus position and dignity is important to know about the overall functioning of any planet in Swati.
Houses Involved – Also, we can’t afford to forget the houses involved as a planet can be ruling different houses and sitting in different house for every person as per ascendant and planet’s position. To know overall affect, we have to consider the houses involved as those areas of life are being impacted.
Interpretation of Mars in Swati Nakshatra – This person can be seen as the real free-bird because Mars represents our actions, will-power & courage and Swati represents independent people as its symbol is wind. Hence, these people would do anything to be free, independent and take actions as they wish. I think rather than courageous, it is better to call them audacious as they know no limit to use of their courage. Obviously, they would love to work in business setup as working under others can be a nightmare for them. It is more so as Libra also represents Business. They can be very pro-active and innovative about any new business idea. But same courage or audacity takes the shape of dominance and control when it comes to relationship, another representation of Libra. Other people will feel the pinch of their dominance, especially their relationship partner. They need to learn how to stay in the limits of brave or courageous and not to go in the zone of audacious or outrageous. Overall, a great position for business person but can have huge problems in relation due to dominance nature.
Role of Rahu – Rahu placement is important to guide Mars in right direction, being Swati's lord.
Role of Venus - Likewise, Venus placement is important to guide Mars in right direction, being Libra lord.
Other Factors – And of course, we need to consider conjunction, aspects, house lordship, house position and dashas etc to know the exact results of Mars in Swati. So, we always need to take a holistic view of chart rather than just 1 planetary position.
Conclusion – So, this is how I see Mars in Swati can work in a chart.