Castle, childish yet sweet person that he is, gives a great picture of Arien. There are also number of incidents pouring in his innocence. Determined, idealistic, fun and yet egotistical, extravagant, what not? He brings out the Arien from the book. His raw pull towards danger is another clumsy trait of Mars men. Of course, there should be a much detached sign in his horoscope that is helping him deal with the Libran tendency of Beckett.
Being an Arien daughter to a Taurean mother and also observing a Libran girl with Scorpion mother, I have come to conclusion that whenever the 2-12 relationship arises, there is always the parent-kid aspect involved in it. Simple, the sign preceding will have lot to learn from the sign succeeding and the sign succeeding can understand very well the sign preceding. This shows clearly in the Castle-Beckett romance too. For the major part, Beckett is protective of Castle.
For initial attraction, the mysterious nature of Taurean, with the rock solid earth crust, stimulates the Arien heart. They love puzzles and seem to look for them around too. Castle got that in Beckett. She however has strong beliefs and not very keen on falling for someone who is always on a fun ride and someone as challenging and frustrating as Castle, never. She needs her peace and calmness. But the genuine guileless Castle with no-games approach and the wonderful trait of kindness they both share, warms up her exterior to let in him to the deeper levels of softness. The mutual respect both share in the professional space also is the basis of Arien and Taurean bond.
However she will take ample amount of time. Taureans need to know that your emotions are not of dwindling sorts and not flutter like a pendulum, for any relationship. But with the image of a playboy, Castle could not give it readily. She had to see for herself and we waited too, a long time for them to get together. For Castle, the excitement of crime investigation was good enough, like any Arien. But good thing is Beckett herself started looking through Castle's imagination which gave him no doubt in sticking around with her. He might deny but he likes her girl complicated, well, a complicated girl whom he can untangle. She is a challenge, a cause and don't ever doubt Arien will leave such challenge unattended. Also her practical approach has given him more motivation to explore, rather than killing his Mars enthusiasm.
On the negative side, he can't take her coldness for long. She has her moments with him, which involve her mother's murder case, but rest everything, she is patient. She forgives every time. These are remarkable traits of a Taurean. Also, the show gives wonderful differentiation of Arien jealousy and Taurean possessiveness. Whenever a third person enters between Castle and Beckett, the reactions are very different. Castle's jealousy shows in itself, targeting the third person, while Beckett's possessiveness can be found in her agitation towards Castle.
I could go on forever but the planets speak for themselves, Mars and Venus. Above all they share a great chemistry and proves me something I believed beyond Linda Goodman books. That there is always the peculiar thing called love with the wonderful timing of universe, that could beat the routine ways of attraction dictated by the signs. In one line Castle summarizes their bond.
"If you're stubborn enough to keep going, I'm stupid enough to go with you"
