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.
Bharani – Bharani is nakshatra of death and re-birth, occult/hidden side of life and instabilities. This nakshatra is also connected with sexuality and attraction. As it is ruled by Venus, the significance of wealth, finance and creativity naturally comes to this nakshatra. For detailed information on Bharani Nakshatra, please check this link -https://www.astrosaxena.com/Bharanaksh .
Aries – As Bharani is part of Aries, Aries sign and its representations become important here. Aries is the 1st sign of zodiac belt, so it represents the things and energy of 1st house of horoscope like Self, Personality etc. Besides that, Aries is the sign of our individuality, our aggression, our actions, our competitive ability etc. Aries is ruled by Mars and it is consisted of 2 and half Nakshatras named Ashwini, Bharani and Krittika.
Mars – As Mars rules Aries, Mars’ position and dignity is important to know about the overall functioning of any planet in Aries.
Venus – Likewise as Venus rules Bharani, Venus's position and dignity is important to know about the overall functioning of any planet in Bharani.
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 Bharani Nakshatra – So, when Mars is in Bharani Nakshatra, person's actions and efforts are going into the dark occult side of Bharani Nakshatra. These people can be very action oriented in uncovering the mysteries of occult world or secrets of death and rebirth. They can be working in medical side or in any field where lots of research work can be involved. They can also be someone interested in knowing the secrets of Universe. They can be materialistically driven. As Mars-Venus energy are coming together and as Bharani is related with sexual energy, they can have a very high sexual drive. At the same time, this nakshatra is related with trans-formative life changing events and as Mars is in own sign which shows a person with great courage, these people can carry immense courage to go through the life changing events. Likewise, whichever houses Mars rules in chart, things related with those houses can go through a major change. If Mars is darakaraka, then change can be seen in relationship matters. Overall, Mars in Bharani relates to dealing with dark energy of occult and transformation with courage.
Role of Mars – As we are trying to interpret Mars only, we need not to look for Mars's position and dignity separately as Aries's lord.
Role of Venus – Likewise, Venus's placement is important to guide Mars in right direction, being Bharani's 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 Bharani. 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 Bharani can work in a chart.
Hope this helps. Please post any comment or query you may have.