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I kind of feel bad writing an answer since everything I really want to say has already been said here. But it has been said by several different people in multiple answers and comments. So I kind o...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/44282 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I kind of feel bad writing an answer since everything I really want to say has already been said here. But it has been said by several different people in multiple answers and comments. So I kind of have to write a readable summary? Also for the things mentioned in comments, they are not written in the correct format. Even the answers are bit... Saying the right things but not necessarily in the right way to match the question? Anyway, the key point to your question is that you want to be space efficient. The way to do this is to not actually supply a real description. Instead you supply the key points of the character and trust for the reader to fill in the blanks and generate the actual description. Many answers here do this exact thing in one specific form or another. You can use them as examples. You say you have a good mental image of the characters. Use that. (Generally the first step would be to get that image but we can skip.) Make small itemized lists of the key points of the character that make them the person they are. One or two sentences. Note the relative importance of the traits and how they are connected to each other. They might be due to same background detail or one might have lead to another. These are also details you want to convey to the reader, not just the traits themselves. Otherwise they will fill in the blanks in some random way. Priority would be based on how central they are to the character and story relevance. If it makes a difference for story, it is important even if it is a minor detail of the character. Then think about how the traits express themselves in practice in small ways that can be observed in the context of your story. These do not need to connect directly to the story, probably should not, but they need to be in the same general context. Same time, same place, same general circumstances. Then as shown in the other answers use small [vignettes](https://en.wikipedia.org/wiki/Vignette_(literature)) in the path of the story to illustrate those traits. ("Use vignettes" would have been a valid answer?) The important part here is that you have to insert the context for those traits within the personality of the character. That means those connections and priorities I was talking about earlier. Why is this important? Well, back in the "list making" stage I said that otherwise the reader will connect the dots in a random fashion. This is not actually true. They will actually fill in the blanks so they best match a stereotype they are familiar with. Readers will not make new characterizations for you if they can avoid it. So they will match the character to a stereotype unless you supply them the extra data on how the trait illustrated fits the actual character. This is the exact thing you wanted to avoid and asked about, so the above paragraph, that can be summarized as "attach metadata" is the answer you wanted. Earlier example in another answer mentioned showing somebody is depressed alcoholic. In such a case you'd insert a small observations such as, "he has been like this since..." or "this is why..." or "but despite being like this he still...". Something to make the trait connected and grounded to the character, not the stereotype. This also means you can use the low priority traits that do not deserve their own vignette in the vignette for a connected higher priority trait. In general, you should vignette in the order of priority and so that story relevant traits are familiar to the reader before they become story relevant. Caveat: This is **not** intended to work as an an actual "how to" guide. I lack both competence and motivation to write something like that. But it should illustrate the main concept and answer your question?