What do these lovely looking girls have in common with each other? They're all criminally insane :D gotta love the crazies!

[From left to right]

• Shion Sonozaki from Higurashi no Naku Koro ni
  http://www.anisearch.com/character/2117,shion-sonozaki

• Shiro from Deadman Wonderland
  http://www.cosplayhouse.com/Deadman-Wonderland-Cosplay-Prop-Shiro-Neck-Collar-Version-01.html

• Yuno Gasai from Future Diary
  http://www.anisearch.com/character/15720,yuno-gasai

• Anna Nishikinomiya from Shimoneta
  http://myanimelist.net/blog/Shoichi

• Nina Einstein from Code Geass
  http://fyeahcontroversialcharacters.tumblr.com/post/115872957714/defending-nina-einstein-a-character-who-gets-way

Screencaptures found online at linked sites. Edited with Photoshop content and textures.