From Sankaku Complex, and found by Zekira.
Japanese were asked to rate their most loved games characters based off games released in 2010. Here are the rankings:
1. Mario (New Super Mario Bros) [9,862]
2. Hatsune Miku (Project Diva 2nd) [6,420]
3. Date Masamune (Sengoku Basara 3) [4,333]
4. Naked Snake (Metal Gear Solid: Peace Walker) [4,142]
5. Ailu (Monster Hunter Diary : Pokapoka Ailu Village) [4,033]
6. Reshiramu (Pokemon Black) [3,208]
7. Wada-Don (Taiko no Tatsujin DS Dororon! Youkai Dai Kessen!!) [2,962]
8. Nene Anegasaki (Love Plus) [2,446]
9. Totori (Atelier Totori) [868]
10. Black Heart (Choujigen Game Neptune) [707]
Mario wins, Reshiram is there purely because he's the new legendary mascot Pokemon, and Hatsune Miku is because of the Project Diva game. Don-chan is 7th on the list, which is still pretty awesome.