Alright let's see what I have owned in the past...
Nintendo DS Lite
Gaming Notebook (yes I'm throwing it under my list, other wise where would the Half-Life games and TF2 fit in?)
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NES (My brother sold it after we got the N64. He had no right, it was mine too. He only got like, 15 dollars for it too.)
PSX (My brother sold it while I was at school after I got my PS2. The PSX was completely mine so he had absolutely no right. I was 11 or 12 at the time, and he tricked me into thinking my mom sold it. He still claims innocence to this day.)
PS2 (2, my first one DREd)
Nintendo 64 (2)
Gameboy Advanced SP
Nintendo DS (2)
Nintendo DS Lite (2)
Playstation 2 (2)
Consoles that I currently own:
NES (original and toploader)
Nintendo Game Boy, Game Boy Color, Game Boy Advanced + SP
Genesis gen 1, gen 2
Sony Playstation 1, 2, 3
Microsoft Xbox 360
Atari, Commodore 64, NES, Megadrive, Playstation, Gameboy Colour, N64, Playstation 2, Gamecube, Gameboy Advance, DS, PSP and PC. Most consoles are in storage, or no longer playable sadly. Some are still working, but due to the controllers not working properly (like the Megadrive d-pad), aren't playable due to being unable to find working replacements.
DS Phat (1)
DS Lite (4)
GBA SP (6?)
And they all still work.
JSYK: My mom and sister got some of these, too. But, since they don't use them anymore, they are all MINEE. (aka the GBA SPs. XP)
We got the GCs from relatives, and the N64s from Nintendo for free for some reason. Too little to remember why.