http://www.youtube.com/watch?v=b7bHkveg3icendofvid[starttext]
Hetalia anime characters with Melancholy of Haruhi Suzumiya Season I opening, Bouken bouken Desho.
[endtext]

http://www.youtube.com/watch?v=bt8jfoz_2kIendofvid[starttext]
Bakemonogatari characters with Nichijou Opening scene. Original Nichijou opening video:

[endtext]

http://www.youtube.com/watch?v=ByVSJqlJ8Ssendofvid[starttext]
Tantei Opera Milky Holmes characters with U.N Owen Was Her? remix. HD 720p.
[endtext]

 http://www.youtube.com/watch?v=COJIitsQ5cwendofvid[starttext]
Angel Beats character with K-On!! opening scene. 240p, dont know if there a higher resolution out there.
[endtext]

http://www.youtube.com/watch?v=If5JufhM3gsendofvid[starttext]Infinite Stratos anime characters with Nursery Rhyme Opening Parody[endtext]

http://www.youtube.com/watch?v=AQOG5yKmCgEendofvid[starttext]English Subbed by Yamatotakeda. Sky High remix with To Aru Majutsu no Index characters.[endtext]

http://www.youtube.com/watch?v=wBH00xKQZY8endofvid[starttext]
K-On!! characters with Nichijou Opening scene. Original Nichijou opening video:

Nichijou (日常, Nichijō?, lit. Regular Life) is a Japanese comedy manga by Keiichi Arawi. The manga began serialization in the December 2006 issue of Kadokawa Shoten's manga magazine Shōnen Ace, and was also serialized in Comptiq between the March 2007 and July 2008 issues. An anime adaptation by Kyoto Animation began airing in Japan in April 2011. And here are the splitscreen version:

[endtext]

http://www.youtube.com/watch?v=UiuN1mrEsbMendofvid[starttext]
Hetalia Liechenstein anime character with Bakemonogatari 4th Opening , Renai Circulation. Original Renai Circulation Video :

[endtext]

http://www.youtube.com/watch?v=nJaNcDseu9Yendofvid[starttext]
Hetalia Belarus anime character with Bakemonogatari Opening 4 Renai Circulation. Original Renai Circulation Video :

[endtext]

http://www.youtube.com/watch?v=N24ctChFAQkendofvid[starttext]
K-On! characters with the anime Ore No Imouto Opening scene
[endtext]