In humans with Mars in Pisces at birth, we expect the following character (although this approach hasn't been very helpful in other Mars transits):
Potential Pisces themes are: Intensification of belief-driven passions and actions; surging into temptation and foolish risk-taking (resembling e.g. the "lets have lots of unprotected sex and get this infection over with" parties with regard to AIDS); mass migration or diaspora events (immigration?); focus on the foreign, mysterious, unknown, exotic, glamorous, theatrical; espionage, betrayal, slippery alliances; slavery-bondage themes; assaults on (and struggles over) the arts; science loses ground to belief.Sensitive, imaginative, fervent; weaves vivid drama, vibrant fantasy. Brooding, moody, surging into temptation, pursing depths & heights. Creative reality-weaving, not scientific reality-discovering. Expect reality to match their wants (impatient with frustrated gratification). Passive-aggressive, manipulative. Looks at things most leave hidden (death, abnormal sexuality, occultism, mysteries of life & the psyche).