That's good. Marketing is in there. So is third-party support. Target audience may be a factor nowadays. System specs is not that important. Price is in there. Online games isn't really. Backwards compatiblity is in there atm...
If by 'killer apps' you mean 'hit titles', then that's in there. Don't know what you mean by nationality and date of born. Wait, date of born refers to launch dates? Then yes, thats definately in there.
As for advice - check out gaming history and find out why consoles flopped/ sold like hot-cakes. Here's somethings from my head:
Marketing:
Saturn
Marketing was so poor that hardly anyone knew about it.
Backwards compatibilty:
TurboGrafx/PC-Engine/and all the duos, duo-rs...
As each newer system came out, they was able to play anything that the older system could play, plus added another feature. But backwards compatibility didn't save this system from it's doom, did it. Backwards compatibility isn't really that important unless the majority of the market has already invested in that console and not the others (such as the PSX). Atari also had backwards compatibilty with the 7800.
Huge third party support:
Jaguar
Had barely no third party support and died a horrible death.
Killer apps (hit titles): ...
Hmm, well, nearly every system has a hit title for it, and nearly every system has at least a mascot. So perhaps the Xbox is a good example at showing things gone wrong. Xbox don't even have a mascot, do they? Hey, neither did Atari. And their systems are dead now aswell...
Nationality: ??
Date of born (launch dates):
Saturn
The Saturn came out 4 months prior to the psx, which was one of the biggest blunders in console launch history! Sony waited 4 months until it was the busiest time of year - Christmas - and appeared with a price tag $100 cheaper than that of the Saturn.. which of course, never would have happened in Sega waited 'til christmas aswell.
Target audience:
kids?
Well, probably more so nowadays. Things to back up this are the emergence of 'mature titles' such as DOA Xtreme Beach Volleyball, and GTA3 - and all the titles that flowed from there in the same nature (explicit language, sexual themes). But back in the day, there weren't hardly any noticable 'mature themes' apart from the emergence of blood with titles such as Altered Beast, Splatterhouse, and more famously, Mortal Kombat. And videogames were probably targeted more towards late teens/adults, but still kids got stuck into them. Perhaps nowadays, it's vice-versa.
System specs:
Dreamcast
This baby come out a whole friggin' year before the emergence of another 128-bit system. If system specs were really important, then people would have been throwing out their 'old-fashioned' 32-bit psx or their 'uncool' 64-bit Nintendo 64 to go buy a 'totally hip' 128-bit Sega Dreamcast. But that didn't happen. Sure, the Dreamcast did alright but it didn't outsell the psx, or N64, and when the PS2 arrived, all the psx gamers flocked over and bought their PS2, leaving the Dreamcast to have a slow upsetting death.
Price:
3DO, NeoGeo
These consoles never really got off the ground due to their incredibly high prices. And recently, you may have noticed the Gamecubes massive sales from their price reductions. Price is definately a factor.
Online games:
These really haven't come off the ground as of yet. Sure, Online games have been around a while for consoles (Dreamcast), but they don't really add up as a primary reason of why a console does well. Xbox live has recently come out, but I don't think that's going to save the system, and bring mega sales with it.
These are just examples and serve somewhat as a guide for you. Hope it helps.