The NN in synastry is amazing. If a person has a planet or asteroid on your NN, they will bring the flavor of that planet or asteroid TO the relationship. It may not show up if it is not a committed long term relationship. However, if it is, it will show up. If it is a hard planet or asteroid, you will eat your fill of it until you want to burst.
I am very strong about the NN in synastry, for this reason. If I see a chart with a hard planet or asteroid conjunct someone’s NN, I tell them to be very careful of marrying the person. If a persons Saturn conjuncts your NN, they will bring restriction and discipline in to your life. You may feel like you are living with a strict father. If you can take this, so be it, but be aware that the relationship WILL bring the flavor of Saturn to it. If a persons Nessus conjuncts your NN, that person will bring the darkest parts of the human soul to you. Do you want that?
I will list some.
Dejanira conj NN—the person will be your victim.
Juno conj the NN–the person will bring you all the best traits of a loyal wife
Vesta conj the NN–the person will bring you devotion
Pallas conj the NN–the person will bring you wisdom
Uranus conj the NN–the relationship will have a lot of ups and downs in strange ways. There may be a lot of make-ups and break ups
Pluto conj the NN— there will be all kinds of primal passion. This will define the relationship, for better or worse. Think of Liz and Dick. Your relationship will be very very passionate.
Moon conj the NN–the person will bring you his heart. This would be wonderful. It would be a child like kind of bond.
Sun conj NN- the person would bring confidence to you
Jupiter con the NN- the person will bring optimism to you.
Chiron conj the NN–the person will bring you pain
Mars onj the NN–the person will bring you drive
Venus conj the NN–the person will be a thing of beauty to you. Your relationship will have a sense of beauty such as the feeling of a musical.
Neptune conj the NN—this may bring great sorrow as you may have had ideals that were not met leading to great sorrow. I have heard this could lead to bad abuse or worse. This is a theory which someone I know is studying.
Nessus conj the NN–the person will bring you abuse
Pholus conj he NN–the person will bring all sorts of explosive outbursts
Child conj the NN–the person will bring his inner child to you and that childlike sense will pervade the relationship. There will be a child to child kind of wonderful feeling between you.
Eros conj the NN–the relationship will be very erotic
Lilith conj the NN–the person will bring his raw sexuality to the relationship. Raw sexuality will be a theme of the relationship.
Medusa conj the NN- the person will have been betrayed by woman but hate men. This theme will be brought by the person to the relationship. This theme will define the relationship, too
Sedna conj NN–the person will bring a severe betrayal by men to the relationship. This theme will define the relationship
Sappho conj the NN–the person will bring eroticism of a literary bent. The music “Bolero” by Ravel would be the feeling of your relationship
Apollo conj the NN–The NN person would adore the Apollo person. The NN person would have a kind of awe for the Apollo person
Proserpina conj the NN—The Proserpina Person would bring some kind of rite of passage from innocence into some form of corruption to the NN person. How this may play out. The Proserpina person may corrupt the innocence of the NN person, in some way.
Orchus conj the NN–The Orchus person would make the relationship about a journey of overcoming. There may be issues of illness, poverty etc. The relationship may be one of overcoming, but they would do so.