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.
Rohini - It is nakshatra of growing, moving forward and being ambitious. It is a nakshatra of business people. Due to mythological story involved, it is also nakshatra connected with sexuality. For more information on Rohini Nakshatra - https://www.astrosaxena.com/rohnaksh .
Taurus - As Rohini is part of Taurus, Taurus sign and its representations become important here. Taurus is the 2nd sign of zodiac belt, so it represents many things related with 2nd house of horoscope like, Hoarded Wealth, Assets, Savings, Finances, Luxuries and Liquid Money. All in all a sign related with luxuries and all the conveniences of life. Taurus is consisted of 2 and half Nakshatras, i.e. Krittika, Rohini and Mrigshira. Taurus' lord is Venus.
Venus – As Venus rules Taurus, Venus’ position and dignity is important to know about the overall functioning of any planet in Rohini.
Moon - As Rohini is ruled by Moon, Moon's position and dignity will also have an important role in functioning and results of any planet in Rohini.
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 Rohini Nakshatra – When Mars is in Rohini nakshatra, these people can be seen as free-bird. People who just want to live their life own way and don't want any interference at all. It is because Mars represents our actions, efforts & energy and Rohini represents independent people who are going ahead all the time as its symbol is chariot & charioteer. So, Mars in Rohini would actually mean someone who just wants to drive his own chariot. They won't like any interference, dominance and control by others and will act as they wish. There is nothing wrong with it as long as person also takes responsibility of his actions especially wrong actions. As Mars is in neutral dignity in Taurus, it would depend on other factors if person will have that courage to take responsibilities of his failures or not and learning from their failures or not. They are always better to work in own business setup as working under others in job setup may not be their cup of tea. As Rohini is nakshatra related with sexual activities and Mars also represents our energy and actions, they can have high sexual drive. As it is also nakshatra of creating something new, they can be putting their energy and efforts in creative pursuits and it would be better for them to have their business also in creative pursuits. Overall, it can be good position for creative pursuits but their adamant behavior of being a free-bird can lead to their downfall. They need to learn to value others' opinion/suggestions in their lives and need to learn from their mistakes to not to repeat them.
Role of Venus – Venus's position will become important in functioning and results of Mars in Rohini as Venus rules Taurus.
Role of Moon - Moon's position will become important in functioning and results of Mars in Rohini as Moon rules Rohini.
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 Rohini. 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 Rohini can work in a chart.