This is highly relevant to OS-Tan fans and people who like to see more Console Girls in that vein. I just threw together some core personalities/traits/features to create a unified bunch of Console Girls. If you want, use it to make fanarts and stuff, as I donate this concept to help a phenomena grow.

Raw Text version.

Now with a bit more added.

What would determine their bust size/age/clothes?

>>4
Portables are all small compared to the big 'uns (they are depicted as children).

Size and relative power of the console affects their bust size, so all of the current/next-genners have large cup sizes, PS3/360 in particular. PSP, DS, and Nomad would appear more developed phsyically than the other handhelds.

In addition, their relative battery life is used as a marker for their stamina, referring to how easily they get tired when 'their batteries run down'.

Mostly, Console girls wear clothes based on the looks of their hardware, so NES would also have Famicom-themed clothes as her alternate outift. DS would have sticker-tattoos (referring to the decorative skins that can be applied to the DS and Lite), and PSP would have a bulletproof vest (referring to the 3rd-party armored shells available for protecting PSPs). Their real-world accessories are applied as things that they own (Odessey has her Pong Paddles, for example.)

I chose to use interesting pieces of hardware trivia to add little quirks and details to the console girls, because it makes them more unique (Dreamcast daydreams and uses her fishing-rod controller to go fishing whenever she has the time to, lol)

Interestingly, there are 3 Wii-tans that go as a set in some fanarts (2chan's version of the Wii-tans), one for the Wii itself, and one each for the Wiimote/Nunchuk.

I figured I'd start with something simple.

>>6
Cute! Quite a nice design.