He is really quite a strong individual, and once he overcomes his childish fears about himself, he can be very effective. He may often be afraid to assert himself because he feels he can be defeated. This attitude may result from being with people who don’t encouraged him. So keep encouraging him! He must build up his self-confidence and disregard anyone who makes him feel bad about himself. There may be a tendency to act behind people’s backs, which you should discourage. Another positive point is that he works well alone.
Consider the case of a 12th house Mars. Mars is the archetypal warrior, representing the ability to set boundaries, be self-assertive, get angry when necessary. People with a 12th house Mars often have difficulty going after what they want. They’re outwardly gentle and agreeable, for the most part lacking Mars’ sharp attacks. You can cross them several times and get no reaction, but one day, someone, possibly you, will receive a full-blown Mars explosion. The 35-year-old computer programmer will disappear and a 2-year-old in tantrum will take his place. But the person acting out won’t know what hit you. He may have sent you vicious emails, vilified your name in the public square, but when it’s time for an apology, he’ll brush it off. To truly regret his actions, his 12th house Mars would have to reach consciousness first.
Other people discussing their Mars in the 12th
what if one has mars in 12th house (me)? i have always been ultra-sensitive to the atmosphere/people around me…..some say i am like a sponge and soak up the energies around me…it is very intense….i am intense emotionally, so if i take on any negativity or intensity or crowds around me i tend to get mentally, emotionally and physically sick.
Mars in the 12th house is much like Mars in aspect to Neptune. It adds force to the imagination and these people tend to have great powers of creativity at their command. They are often artistically inclined, especially interested in those activities related to music (dancing), painting, and images (acting). In some cases the native has an over-active imagination which inflames the sexual nature. If not kept in check, they may be rather perverted. Usually this positions adds a lot of sexual allure.
Mars in the 12th house tends to indicate unfulfilled desires, often in romance. The native may be too idealistic and unrealistic when it comes to affairs of the heart, or in some manner they find that the person they desire is unavailable. Other times this indicates that the native tends to be attracted to people who are in some manner shady and into underhanded activities. Usually in men, this position indicates that they appear subtly bullying to others. Source(s): MS Metaphysical Sciences
Normally, the person is passive-aggressive or simply unaware of the urge to manipulate circumstances. On the downside, the person can easily antagonize others, without being fully conscious of it. On a more positive level, Mars is a good strategist in this house. This person can be counted on to find the resources needed to get themself, or anyone else, out of a difficult situation. One danger hre is the risk of injuries through enemies or animals.