Demby Wishingwell is a character in the Weebleville generation. He appears as a blue hippopotamus in red overalls and is presumably married to Diddy.
His main figure was included with the Weebles Barn Dance playset.
Left: BlueHippo mascot; right: Demby
Demby coincidentally(?) resembles the mascot for installment credit company BlueHippo Funding.