It is in true friendship that your love blossoms with Mercury DaraKaraka…
Mercury as DaraKaraka puts a big emphasis on friendship and exploring mutually enjoyed activities in your relationship. You seek a partner who you can have fun with and who gets your sense of humor. Your spouse will be very communicative, with a lot of hobbies and interests. Mercury is a nice DaraKaraka to have, because relationships based on friendships mean you feel free to express your true nature instead of pretending to be someone you’re not. When you’re young you may have to learn that the person who is “the most fun” doesn’t always make the best partner.
As always, the sign and house your DaraKaraka is placed in provides greater detail. For example, if your DaraKaraka is in Pisces, then your spouse will have some other kind of Piscean influence. The house your Darakarka is placed in will be a significant house for your spouse. They’ll have important planets placed there and their personality will have to do with the qualities of that house. Mercury as DaraKaraka often means your spouse has Gemini or Virgo significant in their chart, such as their Sun sign, ascendant, etc.
When judging your Mercury Darakaraka, it’s important to consider planetary relationships.
Conjunctions and aspects from friendly and enemy planets affect the qualities of the DaraKaraka. Positive aspects and conjunctions to Mercury will create more harmonious communication. Venus is a great friend to Mercury, so Venus conjunction or aspecting Mercury will improve your enjoyment of your spouse. Jupiter is neutral to Mercury, but as a benefic planet, it gives a positive influence to the spouse in a conjunction.
The Moon, however, is an enemy to Mercury. The Moon’s conjunction or aspect creates emotional issues that get in the way of a friendly relationship. A Saturn conjunction or aspect makes your spouse more serious-minded, and so on.
Another thing about Mercury DaraKaraka is your spouse may be younger. Your spouse brings a sense of fun and lightheartedness to your relationship.