From 1991-2002 I was a Nintendo only gamer that played mainly 90% Nintendo games only. I did get into third parties starting with the Gamecube but not that much.
Though my interest in getting into third parties increased and I bought a PS2 in 2003. Eventually I got into third party titles I never tried/played before such as Grand Theft Auto, Final Fantasy, Tekken, etc. Eventually buying God of War which was a first party title from another company.
Over the years my tastes did not change that much other than adding a few new IPs from the companies I usually get games for : Nintendo, Sony, Squareenix, Namco, Capcom and Rockstar.
In 2007 I got into MMO gaming on PC and stopped focusing on console gaming (though I did play a few games here and there). In 2011 - I got back into console gaming and out of the clutches of MMO madness thanks to Super Mario Galaxy and the following months bought myself a PS3 which started a trend of buying new equipment/consoles in every November since ;p.
In 2012 - I got into PC gaming and thanks to PC gaming I was able to get a lot of games from different publishers and developers I never thought I would get a chance to try out. I was introduced to series like Ys series, Batman Arkham series, Saints Row, Dead Rising, Borderlands, Bioshock, Mass Effect, BlazBlue, Assassin's Creed and more - and I enjoyed all of it.
Since then its been a fantastic time being a gamer who has access to the Nintendo, Sony and PC ecosystems. Hopefully in the future with enough funds I'll probably be able to get a Xbox console.