Persona Q. Though, I admit that my answer is very biased because I never played the other Persona games and only watched playthroughs since they were on the Playstations and PS Vita -- yeah I only play on Nintendo systems.
AHHHH thats really hard to decide >.< I'd have to say either Mario or Animal crossing, I really don't know and did you know
I have NEVER played a Zelda or Kirby game but for some reason I really like them 0.0
Narcissu 1st & 2nd. It's so sad...and it will break you down really nice and you'll cry like you get hit really hard, emotionally. It's the best. It's free on Steam, I wish they'd release part 3 sometime.
For what console? I mostly play my 3DS and my favorite games to play on it are Animal Crossing, Pokemon (X or Alpha Sapphire) and Professor Layton. I also played Legend of Zelda: A Link Between Worlds and really liked it, but I find it a shame that once you've completed the game, there's not much left to do. That's why I enjoy games more that are never-ending (like Animal Crossing) so I can get my money's worth.
Dragon Age: Origins and Dragon Age: Inquisition are on the top of my favorites list; in previous topics in the Gamers' Lounge, I do list a couple of my other favorites. :] I guess I consider ACNL a favorite, at least for now since I can't seem to stop playing the game.
As much as I'ld like to deny it, my favorite game hands down has to be Hatsune Miku: Project Diva F 2nd. It's a really addictive game, and I've continued to dump hundreds of hours into it even after I beat it! It's also the first game that I went out of my way to buy $75 dollars worth of yen for lol. I would've spent more yen on it, but I bought the US release of the game as well and then bought the DLC I wanted there. I wish I had a more memorable game as my favorite, though. Like my own namesake! That was a good Game Freak game. B)