One of the things that comes up, again and again, in sci-fi/fantasy, is the notion of connectedness, the family you make. It is a thread that runs from Star Wars to
It is very true that when a group shares a set of experiences, especially if they cannot discuss those experiences with the wider world, they become close. But it can go so far beyond that when the group is a team, when they have a specialized set of skills that integrate well. Consider Buffy and the Scoobies. She is the fighter, stronger and faster than a normal human.
Likewise, Han and Chewbacca are essentially blood brothers, and although Luke and Leia are siblings, they don’t know that when they forge their bond. Through the trials and tests, these four become as close as if they had grown up together, a bond that lasts the rest of their lives. Between them, they have the skills and contacts to move within any circle, interact with any strata of society, from smugglers, thieves and beggars to the heads of planets and empires, and the ability to persuade any of them, whether by money, force, or Force. This makes them an incomparable team for whatever needs doing, especially in the political arenas, both overt and covert.
While often in circumstances like these there are fleeting or unrequited romantic feelings (consider Xander for Buffy, or Willow for Xander, which resulted in a brief fling that stressed two established romantic relationships), in the end the feelings between members of the group are generally those of a more familial love. “You’re like a brother/sister to me” is one of the most common sentiments. The love is generally understated, or described in terms of trust and history; these are people who know the depth of feeling they have for one another, and feel no need to state it time and again.
Often, in life, the families we forge in adulthood serve us and support us better than our blood families ever could, and this is merely writ large in science fiction. It is the unique mix of talents, personalities, and circumstances, that makes a sci-fi team so much more magnificent than a single hero, and something so many geeks aspire to. After all, if you could find, not a single person that compliments you, but a whole group that elevates each other, and that loves you as much as you love them, what more could you ask for?