A Meta post
The closest I can think off would be to start a Meta Post and put the list there with links to each item. To give you an idea of what I am thinking of you may want to have a look at some of the series that we have on this site:
Anatomically Correct Series
Creating a realistic world series
My “Alien Message” series
As you can see someone started a series and often other people contributed to this series, too. You can just create one of your own and link to the Meta Post in your Main Site questions.
But: Please remember that each question should stand on its own.
You can link for additional information, such as an Anatomically Correct question that almost always links to "A list of all the Anatomically Correct questions can be found
[here](https://worldbuilding.meta.stackexchange.com/questions/2797/anatomically-correct-series)". But you still have to mention all the important information in your question - it should not be necessary to read additional questions to understand your new ones.
It might add clutter to the question, but if you always put the same requirements at the end of your questions people who are familiar with your concept will just skip that part and people who are not familiar know what the requirements are. Think about it like this: maybe you find out that you need to change some of the traits, because someone mentioned something that made you re-think your current approach. It would be weird if later someone discovers an older question from you and looks at the linked list of requirements, only to find that the answers to the older question don't fit the requirements.
Maybe you can also only mention the traits that are important for the question you are currently asking. That depends on which traits you are referring to and what kinds of questions you want to ask. But in general I'd recommend you start a series post on Meta once you have maybe three or four questions and plan to continue for some time. Then you can link the Meta Post for those that are interested in the concept, which makes it a whole lot easier to find everything and know what may be coming up. And the list of common traits can just be a list at the end of the post. It may not be perfect to copy-paste that list to new questions, but it's important that every question stands on its own.
You should also have a look at the reference tag and its description here:
For questions that collect links to reference material. When used to index posts that are related to each other, such as questions in a particular series or about a particular world, the question should have a single community-wiki answer to collect the links.