Mari Jones is a workaholic person who loves helping people around her. From giving free rides to giving away huge amounts of money, she doesn't actually care if it is to help other people even just a little.
Her soft voice and flirtatious personality makes her a constant target of the men in the city's cheesy pickup lines; which amuse and bother her at the same time.
After her father died during a call as a firefighter, due to a lack of ambulances to transport him to the hospital to get treated, MJ fell into a five year depression stage before deciding to move forward and become a paramedic in order to prevent what happened to her from happening to other people.
After moving to Los Santos and getting started as a volunteer at Pillbox Medical Center, she started to understand the love and passion her father had for his job and saving the lives of people who couldn't do so themselves. Building a love for the community in her work as a volunteer, Mari pushed herself to her limits in order to get accepted into the EMS department.
After four months she went up on the EMS ladder going from a simple volunteer to a Captain of High Command. Her hard work and love for saving people's lives made her the perfect candidate to become High Command on the EMS front lines.
A restructure of EMS has put her in the position of chief, making decisions that will hopefully benefit the longevity of EMS within Los Santos.