I updated my Quick Reference cheat sheet that I talked about a page back here:
https://f95zone.to/threads/something-unlimited-v2-3-6-gunsmoke-games.326/post-8135422
I confirmed that Artemis indeed does require a Level 1 device. I had Cassie and Donna Troy's Level as 3, they actually only require Level 2 devices (confirmed via a playthrough). Also, Metallo, I sent him on a capture mission, he didn't end up in the Legion Hideout, he was still inside Lexcorp the next day.
Anyways, Version
Two Three of the Reference Sheet.jpg that I put together is attached, updated for SU Version 2.3.7, is below. Let me know if I missed/messed up anything!
Note that I am not updating this for 2.3.8, as only minimal content was added in 2.3.8. New Mercy sex scenes, which wouldn't change my entry for her on this reference sheet, and two (clothed) intro scenes for Grail and Myrina. Use the thread search function for exact details on how to unlock the two associated intro scenes in the meantime, but you really aren't missing anything yet until the rest of the content for Grail, Myrina, and Themyscira is added in a future update.
As noted before, the purpose of this reference sheet is to give people a quick reference regarding pertinent details about various characters, that doesn't involve pages and pages of scrolling and waiting for .pdf pages to load. The game guides that have been created are still quite useful, and can give you a lot of details about each character, and this quick reference isn't intended to replace those.
Rather, it's a quick visual guide that can show you things like what control device level a Superheroine will require, who she has dual leash scenes with, bonuses for the various Supervillains and Supervillianesses that get posted to various assignments such as Lexcorp defenses and such, that sort of thing. So it's a 'compliment' to the other guides, not a replacement.
Enjoy!