I will explain myself as I come up with explanations. Phantasy Star Online: This game holds an extra special place in my heart. It was the first online game I'd ever played (because I didn't really care about Everquest) and I made a few very good friends through it. One of which I lived with for many a year and met a bunch of good people through. Suffice to say, this game is monumentally important to me. Had I never played it, my life would be incredibly different. Final Fantasy VII: This was the game that opened up RPGs as a genre for me. Hours into disc one and I felt I could not get enough of this genre. (Joke's on me though because nowadays, I've become sick of the JRPG genre and it's constant shonen anime tendencies. )
Bionic Commando: I'm not gonna lie, most of my memories of these were watching my brother play it when I was really young, so I felt I needed to play it and beat it too. Fortunately, it's a great game that showed me that action games without a jump could be great too.
Digital Devil Saga: This is my favorite Atlus game. Something about it resonated really well with me and one of my good friends (the uh, very same one that killed himself in 2012, unfortunately). I liked it enough to get not one, but two tattoos based off it (Heat and Gale's Atma symbols).
Final Fantasy Tactics: My first and favorite TRPG that, much like FF7, opened up the genre to me. Not that many come out, but at least there's Super Robot Wars and Tactics Ogre.
Alan Wake: Aspiring writer enjoys a game with a novelist as the protagonist. In other news, the sky is blue. Seriously though, I dug the story and enjoyed the characters a lot. It was nice to have a modern game that wasn't rah rah military chest bumping.
Maximo: At the time when I first played this, I was caught up in that frenzy of 'man, Japan sure makes all the best games and the US doesn't make anything good!'. I started branching out more afterwards. Being a Ghouls n' Ghosts spiritual successor probably helped.
Super Mario RPG: I got my copy as a birthday gift from my best friend when I was in 7th grade or so, so I treasure this game. It also kind of cemented my enjoyment of the JRPG genre (because I got it after FF7).
Resident Evil 2: My first horror game that took me a year or so to finish because I was such a chickenshit that I could only muster the courage to play it until I got to a save point every time. Gave me an appreciation for tank controls that I still have now. Granted, I would say that I'd prefer Resident Evil 6's gameplay to it though. Ease of movement and combat is a plus.