I believe that if you are going to add people's names here on the forum, it would be interesting to ask them directly about how they would like to be represented. Or, create a sample drawing and ask them to improve something that represents each one. For example, a robot chosen by each user and in the image they would appear with their username above their head and below their username a medal for more merit, a handshake icon for trust, an eye for more recognition, something along those lines. But, the ideal, in my view, would be to have a robot or humanoid according to their choice.
Edit:
I made this example of more or less what the idea I told you would be like.
IMAGE
It might be hard to get everyone's opinion on how they'd want to be represented, especially those not that active any more.
We're talking mostly OG personas here as others will be generic characters doing stereotypical things.
We could ask those active (like Theymos) for opinion!
I think it would be best to send the message right away, since we have time for them to respond. And whoever responds can just add it to the project. Otherwise, there's not much we can do. But the ideal thing in my view would be a personalized one since these are members who make/made a difference, it's worth trying.