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Like @Rasdashan, I am a discovery writer. My characters take shape as I write. You might find that this approach works for you too. That said, since you wish to write about a group of characters, ...
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Source: https://writers.stackexchange.com/a/43827 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43827 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Like @Rasdashan, I am a discovery writer. My characters take shape as I write. You might find that this approach works for you too. That said, since you wish to write about a group of characters, you might want to look into group dynamics, and various party structures. [Here](https://writing.stackexchange.com/a/36450/14704) is my answer to a question about writing a story about a team. You should find it useful. The thing is, you are not writing about several stand-alone characters. You're writing about a group. Think of the group as a unit. This unit interacts with outside challenges together. The choices the unit can make are dictated by what kind of characters are in the group. It's not just "this special ability is needed to pass that trial". It's "we have a curious character who will poke things he shouldn't, we have strong character who will save the curious character from whatever he has unleashed, and we have a smart character who will figure out what on earth happened", for example. Consider what kind of interactions with the environment you'd want your group to have, what kind of challenges they would face, and make sure there is someone in the party who could naturally take the action you'd want them to take. At the same time, of course, there is the interaction within the team. Those are the bread and butter of a team story. There, you want a measure of conflict. You want contrasting characters, because the contrast makes each shine the brighter. You want different viewpoints, so they can disagree, and learn from each other. If all characters in the group are of the same mind, they might as well be one character. If you struggle to find your second character, look at your first: what character traits does he lack? Where is he perhaps "too strong"? Balance him out with the second. Adding a third character, consider what is still missing, and what traits are so polarised that you might want a balancing character in the middle. Or try to create a (relatively) balanced group right from the start. Whatever way of thinking of it works better for you.