Ok...So I actually started making my own sprites and editing them...but when I actually use them in a game they still retain their background color...as in they character is in a colored rectangle the pic is on the bottom for better understanding
make sure you imporst the characterset, and choose the background to be transparent. Else, open another charset sheet, and copy the background colour, and use it in that one. should work oo thought,..
When importing the Character Sets you should left click and right click the Backround to set the Backround as Transparent. Basicly what DG said, but I wanted make sure that you knew how to do it. Hope it works out! :)