[...] Which one is your favorite?
There are many visualizations from Newbies, but only 1 suits me, the image below is my choice:

Look how cute it is, small body, round head & hands on the head which conveys complete confusion. Then for the second image sample, i don't like the depiction of the whale, no problem for the moderator, but the big robot with the whale logo is not very good in my opinion. Maybe it would be better if you could make a robot that looks like a whale & has a bitcoin logo.
We have whales in forum, we also have moderators, but do whales represent wisdom or intelligence? not at all, we should have other robot representations for the wise & the smart, look at how:
Bitmover makes Bitcoindata.science [1]
TryNinja makes Ninjastic [2] & Bitcointalk Notification Bot [3]
LoyceV makes Loyce.club [4]
Those above should have their own representation, right? it could be a robot with depictions of owls or other wise or smart entities, who tries to build Bitcointalk better over time.

For the representation of Satoshi i like the model above, it is very synonymous with a wizard, Satoshi is a wizard (we have to admit that) who does his magic in the finance field & how money should work these days.
1 Additional ThingA few days ago you asked things about Bitcointalk such as how to visualize spammers & merit, are we forgetting "The Trust" here? it is part of the forum. If you also want to apply the idea to a trust system, i have an idea, you can make a depiction of it in the robot's eyes. A red-eyed robot is a robot that has more negative trust than neutral & positive, a yellow/black-eyed robot has more neutral trust, and a green-eyed robot has more positive trust.
[1]
https://bitcointalk.org/index.php?topic=5445282.0[2]
https://ninjastic.space/[3]
https://bitcointalk.org/index.php?topic=5248878.0[4]
https://loyce.club/