I'm a big fan of free spirits. Paul used to have a lot of just random ones in the game, as stuff you'd see while walking down the street: "What appears to be a Plymouth Duster stands up and walks over to the actor's Eurocar and just starts bashing on it, muttering something about, 'Kids nowadays.'" Another personal favorite is the free spirit that no one knows is a free spirit,
like Billy in Baptism of Fire. I've thought about doing this as a player, but I'm not sure I could reasonably keep the secret for very long around our players.
In my own fiction, free spirits often act as overlords of some niche, whether that means they become a fixer for a stable of runners, or a guardian angel for a neighborhood, or the president of a local clock-makers guild. Their nature makes them the distilled essence of
something, made sapient, and that something often becomes a major facet of their personality*; similarly, free spirits who were conjured [particularly allies,
pace Seeks-the-Moon] often contain some facet inspired by their summoner; sometimes, the material of which they're made [for example, the car in the case of the city spirit above] informs their nature, as well, such that a spirit summoned in the shape of a beautiful human woman is likely to
act at least a
little like a beautiful human woman, while a spirit summoned in the shape of an animated bundle of sticks and leaves is unlikely to act like a billionaire playboy. But then it's
extra interesting [or funny] when they do.
Those three aspects - focus, summoner, and material - are joined by a fourth: mana, the common thread to all spirits and magic, the burning heart of some reality far away from our own. All spirits are different vessels, filled from the same pitcher, and they're all connected in some subtle way; this usually manifests itself in a vague sense, whenever you're dealing with even the most basic spirit, that there's something it knows about reality that you don't, and that it's not telling you,
particularly when it comes to your treatment of other spirits, or things that happened when other spirits were present. I like even my Watchers to seem like somewhere deep inside them lies an intelligence beyond our comprehension, and it's just
not quite shining through the dim lens that is a Watcher, until every once in a while it turns its attention on you and something beyond shines through. If you can give people goosebumps with a force zero ball of astral fuzz, you're doing magic the way I like it.
*edit: Wow, what an awful explanation! Most of my spirits have a focus: if you're a fire elemental, that focus is pretty obvious. But when free spirits arise spontaneously, it's usually because - and here's where you have to bear with me on some SR/ED "basics of magic" bullshit - if enough people
think or
feel something, it becomes real. So if there's enough passion for clock-making in the world, eventually a sapient clock-maker will exist. If the belief is strong enough, and believed fervently by enough people, the being that arises will be godlike in its power: if we all believe
really strongly in justice, eventually a God of Justice - call it a Passion, if it please you - will arise, with real power that it shares with real followers. This is the nature of mana: it turns intention into reality, whether that intention is purposeful [spellcasting, for example] or unconscious [we all subconsciously think often enough about rusted hulks of cars coming to life that eventually, one's actually going to]. So that's what I mean by "focus," whether you're the "God of Justice" or the "President of Clockmakers" or the "Guardian of Some Neighborhood."