Here's what I foundI have backsprites for all four, if anyone is interested.
Regarding the Sekibanki Sprite from Pixiv, I believe this is the source you're looking for:http://www.pixiv.net/member_illust.php?mode=medium&illust_id=38538124
Quote from: chaosakita on September 18, 2014, 08:20:13 PMHere's what I foundI have backsprites for all four, if anyone is interested.Those sprites are amazing! I actually would like the backsprites for them, please... xD