Who should a Pisces marry?

They should marry anyone they fall in love with. What star sign someone has is completely irrelevant. Everyone is different. Two people born on the same day in the same place, who supposedly should have the exact same traits because of their star sign, will be completely different. So if someone is a Pisces, the person they marry can be of any star sign. They will be the right person based on their personality, but their personality is not determined by when they were born.