That was a thread derail? I thought it seemed pretty in-line with what was being talked about, since -tans do often get subject to Rule 34 quite often.
Anyway, to add to what was already said:
I created the race queen-like -tan from the tread WizardStan linked. My good friend created the 2nd one that used to be shown there, but he changed his Pixiv settings and locked the image from off-site viewing by accident.
I did some research over the past year or so regarding the subject, but I'm no expert, so some of my info may be inaccurate. Most -tans aren't created as pr0n, or with pr0n in mind, but rather get subjected to it later due to sexual appeal and Rule 34. Arguably, XP-tan is the subject most often taken advantage of, and with her appearance you can probably see why.
OS-tans tend to have less anthro-type features since, as you've mentioned, there isn't really any tangible form they can take advantage of other than colors and recognizable features or images from the OS. Those features tend to get worked into clothing, accessories, bodily appearance, and personality. Meanwhile console-tans tend to work in features from the console itself, including buttons, screens, colors, and so on. These tend to be more anthropomorphic. In this sense, my Pandora-tan is a failure.
You could pretty much make a -tan (or -kun, a male version) out of almost any product by taking defining features or characteristics from the product and applying it to a character. The easier it is to tell what the product being represented is, the more successful the design (generally speaking).
These are most often not officially-licensed designs, and almost always originate from the art communities. The ones that become the most popular tend to end up being thought of as the 'officially recognized' ones.
~ However, the most important aspect of a -tan is the concept of moe. ~
Pronounced "mo-eh," it's the concept of loveability or attraction, things you find likable about something. You could think of it as "that fuzzy feeling you get when you see or think about [insert noun or pronoun]." While this concept seems to be used mostly for anime and manga-styled girls, one can have moe for cute animals (or anthros), or even, in some cases, products. Fairly recently it also seems to have become a sound effect in anime, and possibly even among otaku in Japan, something you say when you get that feeling or see someone getting that feeling.
And after that ridiculously long essay, I conclude this post. :lol: