Yuno Gasai from Future Diary and Nyuu/Lucy from Elfen Lied would be best friends and partners in crime when they both go off killing people. Put these two together in an anime and tu will have a blood bath anime show.
Omg! I had this sudden Idea that Toshiro and Edward can be buds because there both short! XD Also France and Tamaki And Orihime and Mikuru because all 4 of them are so much a like! I'll post a pic later if I can!