Good question. I've had it for so long... back when I brought the Great Teacher Onizuka box set over 10 years ago! https://web.archive.org/web/20040705201806/http://www.madman.com.au/ViewItem.php?CatNo=MMB082
I think there was an official MadMan mini site for the series at one point which had avatars available to download, but I can't find any references to it for the life of me.