You can already have most of that with existing features around smart collections or publishing collections.
- Actor collections → smart collection based on an advanced filter by actor
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Universe collections → that’s more or less possible manually or based on some filter criteria (e.g. smart collection based on advanced filter
Studio=Marvel Studios). - Seasonal Collections → this one is probably the trickiest of your suggestions – you can currently only cover this with manually assigned collections
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Smart Collections → there’s already a few suggestion for that…
- automatic/intelligent suggestions based on what you liked/watched → [feature] intelligent user behaviour "you might like this"
- active suggestions by/to other users → Recommend server content (not just queued)
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Recommend by Server Admin → create a collection and publish it
Publishing Collections | Plex Support
You might want to read up on what collections are already capable of 
