GameBoy Color: Pokemon Blue

Gameboy Advance: Kirby Nightmare in Dreamland. I played the shit out of that game

Nintendo DS: Mario Kart DS

Gamecube: Hmm... Kirby Air Ride or SSBM... ok I pick Air Ride

Wii: Super Smash Bros. Brawl

PS3: Skyrim

iOS: Doodle Jump

I totally see why you guys would pick Pikmin I have Olimar as my Avatar, but Wind Waker was just out of this world to me.

SNES: Super Mario World
N64: Mario Kart 64 (close second is Goldeneye)
GC: Resident Evil remake
Wii: Super Mario Galaxy 2
3DS: Super Mario 3D Land
PS Vita: Gravity Rush (only have 3 games so far)
Game Boy: Donkey Kong
PC: Commandos
PS2: Dark Chronicles
PS3: Demons Souls (only have 4 games)

Atari 2600: Cookie Monster Munch

NES: Super Mario Bros./Duck Hunt

SNES: Killer Instinct

N64: Super Mario 64

GCN: Resident Evil 4

PS2: Shadow of the Colossus

Xbox: NHL Hitz 2003

NDS: Meteos

Wii: Wii Sports/Resort (Retail)  -AND-  World of Goo (WiiWare)

X360: Burnout Revenge (Retail)  -AND-  Insanely Twisted Shadow Planet (XBLA)

PS3: Journey Collector's Edition (Retail)  -AND-  Limbo (PSN)

PS1 : Tekken 3
PS2 : Tekken 4
PS3 : Demon's Souls

GBA : Pokemon Blue
PSP : Monster Hunter portable 2
PSV : Gravity Rush

Wow, Mario is all over these lists!

NES: Zelda 2: The Adventures of Link
Gameboy: Pokemon Red/Blue

Genesis: Ranger X

SNES: Chrono Trigger/Super Mario RPG (tie)

Sega CD: Sonic CD
Virtual Boy: Virtual Boy Wario Land
Playstation: Driver 2 (But I only just started playing PS1 JRPG's)
N64: Mario Kart 64

Gameboy Colour: Game & Watch Gallery 2

Dreamcast: Sonic Adventure 2 (but I just got Grandia and Skies of Arcadia)
Playstation 2: Grand Theft Auto: Vice City
Gameboy Advance: Advance Wars 2: Black Hole Rising/Fire Emblem: The Sacred Stones/Golden Sun/Metroid Fusion (tie)

X-Box: Halo: Combat Evolved
Gamecube: Metroid Prime

E-Reader: Pinball
Nintendo DS: Advance Wars: Dual Strike/Chrono Trigger

Sony PSP: Gran Turismo (so far, but I haven't played most of the games I own for it)
X-Box 360: Forza Motorsport 3/Lost Odyssey/Mass Effect 2 (tie)

Playstation 3: Mass Effect 2/Valkyria Chronicles (tie)

Wii: XenoBlade Chronicles (so far, have yet to fully complete 1 game)

and PC: Warcraft 3 with expansion.

Sorry, my for my favorite RPG consoles, there are no tie breakers. However lots of close runner ups, which get NO glory.

SNES - Teenage Mutant Ninja Turtles: Turtles in Time, Super Mario World, Street Fighter 2: Turbo

Genesis - Gunstar Heroes, Adventures of Batman & Robin, Sonic 2, X-Men 2: The Clone Wars, Super Street Fighter 2: Turbo

PS1 - Xenogears, Star Ocean: The Second Story

PS2 - Shadow of the Colossus, Zone of the Enders: The 2nd Runner, Kingdom Hearts 2

PS3 - Don't know yet

PSP - Don't know yet

Hmmm. Haha, this is really hard! How do I define "favorite?" The game I spent the most time playing? The game I look back on most fondly? The game I enjoyed the most at the time? It's tough.

Sega Genesis -- Sonic the Hedgehog

GameBoy -- Pokemon Silver

N64 -- Diddy Kong Racing

GameBoy Advance -- Zelda: The Minish Cap

GameCube -- Rogue Squadron II: Rogue Leader

Wii -- Super Smash Bros. Brawl

I don't have a 3DS yes, but I'm planning to get one within the next month and I can say for sure that my favorite 3DS game so far is Kid Icarus: Uprising.