Possible Clues:

• Bear with a "thotful spot"
• Self-professed 'Bear of Very Little Brain'
• Winnie, for one. Actually, I can't really think of any others..
• Character who made 'The More It Snows' ring round
• Bear of very little brain
• "Oh, bother" speaker
• Bear of children's lit
• Milne's tubby little cubby
• Legendary Canadian bear
• "Bear of very little brain"