Well, My first day I owned a Wii U was on May 30th on the launch day of Mario Kart 8. I got the Mario Kart 8 Deluxe Bundle. Also, the promotion so technically I got two games on day I bought it
Mario Kart 8 and Pikmin 3

November 2013.

Call of Duty Ghosts, Monster Hunter 3 Ultimate, Super Mario 3D World.

Funny story, I got my Wii U on October 2013, but I started buying games for it before that, first 3 ones on May 20th because a friend of mine was coming to visit from USA and I had to take advantage of it. By the time the console was purchased (Wind Waker HD bundle) I already had 6 games (including a disc copy of Wind Waker HD so I sold my download code).

Resident Evil: Revelations, The Wonderful 101, Splinter Cell, Batman: Arkham City, Call of Duty: black ops 2 and Wind Waker HD

Feb 2013. Just Zombi U in the bundle and sold it sealed. Bundle was already discounted to AU $299 and sold Zombi U for $50 so in my head it cost me $250. IMO that's what the system's worth so I'm happy. Then I got Super Metroid for something like 50 cents? And after a while BLOPS2 and W101.

I queued at midnight launch for the WiiU and I got NintrendoLand, ZombieU and NSMBU.

January 2013,

New Super Mario Bros U. Although I did transfer my Wii over and softmod Wii mode lol

June 2014

Mario Kart 8, Wind Waker HD and Super Mario 3D World.

April 2013

Nintendo Land, NSMBU and Tekken Tag Tournament 2

30.Nov 2012: Nintendoland, ZombiU, Trine 2

First Wii U (at Launch, basically the one of my brother): Nintendo Land, NSMBU and AC3
When i got my own Wii U i started with a bundle including MH3U which i already had. The bundle was the cheapest used one at that time. Never sold my second copy of MH3U though.