I love how Ian kinda took this as the thread of ultimate regrets. I have quite a few. I could have owned a copy of the original Shantae but passed it for Wario Land 4. I also stupidly lent out my copy of Clayfighter Sculptor's cut out to somebody who 'lost' it back in the day and now that game is worth about $300. :/
I'll try to isolate it to stuff that's come out within the past couple of years to avoid this list growing to an unreasonable size. Off the top of my head...
3DS:
Kirby Triple Deluxe- A lot of these are going to have the common theme of "I spent several years unemployed besides my loose freelance art gig, which brings in a pittance." It took me a few years to get a copy of Return to Dreamland, and this game seems to be closely tied to that as far as it's engine goes. Sign me up!... aaafter I get some holiday money that's probably going to Bayonetta and Captain Toad first...
Bravely Default- The demo on this one had me playing on and off between sessions of Masuda Method in Kalos, unto which I liken to attempting to win a lottery to enter the Tour De France with how much bike riding goes on while trying to get teh shiniez. could have gotten this one for my birthday, but passed it up for some older stuff, including Radiant Historia and A Link Between Worlds!
Pushmo/Crashmo-Lumped together because I'd want one of these. Or Pushmo World. I'm kinda a sucker for Intelligent Systems games, even if these don't immediatley appeal to me.
Crimson Shroud-Oh Man, I am a HUGE fan of Matsuno's games. Weather it's Tactics Ogre to Vagrant Story, this guy has a knack for making interesting games with intrigue steeped in European historical drama. one of many things I want to get get an eShop card and go on a binge for.
Azure Striker Gunvolt- This came out shortly before I got my recent job, but I just... haven't gotten it. I keep forgetting when I have money or have more pressing things to get. Mighty Gunvolt doesn't seem worth the lage asking price when it's not bundled, and... I dunno. I should probably invest, but I am just not feeling it?
Etrian Oddesy 4- Gui kinda has me sold on this game... at the same time, I've had the demo sitting on my 3DS for some time and just... haven't touched it. if I end up trying it and liking it, I'll hunt down a copy/get it from the eShop, and then probably want Persona Q even though the Persona Games just... don't really jive with me. I dunno. I'm bad at managing what the hell I do with my time IRL, and I find myself following a social link FAQ because I don't know how the hell to approach Persona 3
Code of Princess- I actually REALLY wanna get this one, but again... money and just having the title get pushed to the back of my mind. I find Atlus stuff really hit or miss with me.
Wii U:
Child of Light-This is just about the only really appealing game that Ubisoft has put out that I personally want to check out since maybe... Scott Pilgrim? There might be some other things, I dunno. My dad and friends have killed my desire to play Assasin's Creed games ever again, Watch_Dogs hasn't jived with me as much as I would have hoped, and uh... I really, REALLY don't like Rayman and question how the heck that franchise even became a thing. Also, I kinda associate Rayman with Tonic Trouble.
Guacamelee- Never got this on other consoles, and I figure this is probably the place I'll get it for being able to off TV play or something. I dunno. this is probably a back burner title after so many others I actually REALLY wanna get.
(I need some sleep, I'll edit this post and finish the list later, but it includes stuff like Dark Souls 2, GTA 5, and just... a plethora of other stuff.)