Mars represents the desire for action and physical energy.
Mars in Leo
Combative strength. He always realizes his schemes. Can undertake big projects, conclude them successfully and receive the deserved rewards. He likes responsibilities and difficulties above all, and imposes himself forcefully.
Weaknesses: Combative force can lead to violence if he thinks it necessary. He is bold, presumptuous, intrepid: he likes to face danger and can naturally have a few hiccups on the way.
Mars in XII
All his energy is put into the work life. He loves research. He could be a lab worker, doctor, police officer, teacher specializing in hospital, prison or hospice work..
-73 Square Sun - Mars
He is violent, impulsive. He throws himself headlong into situations without ever thinking of the consequences of his actions. This can cause a lot of problems. He cannot stand still and channels badly the energy which he possesses.
-82 Square Mercury - Mars
While his spirit is lively, it is also cunning. He often acts without thinking, he throws himself into things and exaggerates - and this can bring certain problems. He is nervous and irascible. He can develop others' ideas, while they hesitate - he never does: he presses on.