Notes:

The Series X is a big dark monolith built to run silent, so Series X-tan is a tall, shy mute girl who gives off an intense dark vibe that makes her seem more intimidating than her actual gentle personality. She has an overall cybernetic motif and is never not wearing her dark gray bodysuit, even when wearing civilian clothes on top of it.

"SeX", as she is called, is also immensely powerful compared to the other console-tans just like the system itself, but is too sweet to show off and is happy to share her games with other systems rather than hoard exclusives (if she doesn't accidentally scare them away first).

More of her on the Console-tan Booru

Slight edit compared to the source image to make it safe to post by removing any lewder outlines or shading. There's also a SeS-tan (Series S) pic by the same artist but it's way too lewd to post here, check out his Twitter.