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It sounds like you're describing an ensemble cast, where there are several key characters but no single main character. While the page I linked to talks about TV/movies, the same applies to writte...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/25580 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It sounds like you're describing an [ensemble cast](https://en.wikipedia.org/wiki/Ensemble_cast), where there are several key characters but no single main character. While the page I linked to talks about TV/movies, the same applies to written works. The style is not at all uncommon in, at least, science-fiction novels (what I mostly read). To proceed, start writing. :-) Some writers divide up chapters by point-of-view characters (for example, Jo Walton's _The Just City_, Cixin Liu's _Three Body Problem_). Others divide up chapters by locale/subplot, with several active key characters being shown in each (for example, Eric Flynn's _1632_ series, Hugh Howey's _Wool_ series). Make sure your readers always know where the are, story-wise, and you should be fine.