The Melancholy of Haruhi Suzumiya
They are sorted by series, if you wish to view the details of the image (i.e. character name, series).
Please note: many of these extractions will either have "PNG extracted by Karen of Heart's Melody or Mesmerized" stamped somewhere on the image. I am the same person that extracted these, so please do not think I stole them from Heart's Melody or Mesmerized. I was the owner of these two sites back in the day. I was just too lazy to put new stamps on them lol.
The Melancholy of Suzumiya