I searched in Japanese and also found very little info/pictures... that's rather strange, since it's quite popular here. For once, animenfo.com failed. It's got it listed only as "Konjiki no gash" (forgot the bell) and the movie, which is titled "Knojiki no gash bell". >.<
Here's a general image search for gash bell...
Here we go... animenewsnetwork comes thru!
Official site. Has a characters section.
Here's the page for Gash Bell from ANN: http://www.animenewsnetwork.com/ency...me.php?id=2290
(OT - I don't understand the reason for the name change, since it's not hard to say Gash. But maybe they don't want kids possibly associating gashes/cuts with the cartoon. I'm not even sure what "gash bell" is supposed to mean, anyway.)