Possible Clues:

• Williams, the Splendid Splinter
• Famous Kennedy
• Jane's former hubby
• John and Bobby's brother
• "Dilbert" Generic Guy
• Danson of 'Dad'
• British poet Hughes who was married to Sylvia Plath
• Talking stuffed bear of movies
• Mack of old TV
• Main character on 'How I Met Your Mother'