There's a Jewish custom of inviting ushpizin, holy guests, into the sukkah each night. In the most traditional paradigm one invites seven (male) Biblical figures; in a more contemporary paradigm one invites Biblical figures of both genders. Each of the invited guests represents or channels a particular mystical energy, so in calling on that figure to invite them to one's sukkah, one is also inviting that figure's qualities to flow into the sukkah and into one's life.
For instance, on the first night it's traditional to call on Abraham. In kabbalah, Abraham is connected with the sefirah (divine quality) of chesed, overflowing lovingkindness. On the second night, one would call on Isaac, who is associated with gevurah, boundaried strength. (And so on.) Here's a lovely Seder Ushpizata by Rabbi David Seidenberg -- a liturgy for inviting and calling-upon these incorporeal guests and their holy qualities. And here's a fantastic infographic on the ushpizin, which lists the traditional (male) ushpizin, an alternative list of female ushpizot, and even a set of Hasidic figures who can be mapped to the seven nights of the festival.
Shortly before the holiday began I found myself pondering aloud on Twitter how one might map these seven kabbalistic qualities to characters from Firefly. The tweet drew enough response that I figured it was worth expanding into a post! If one wanted to welcome the crew of Serenity on all seven nights of Sukkot, in what order would they be called-on, and what qualities would we ask them to channel for us?
(If you are not a fan of Joss Whedon's tragically short-lived "space western" Firefly, the remainder of this post may hold limited appeal for you. No disrespect is intended, in this bit of whimsical geekery, to the traditional custom of inviting Biblical ushpizin.)