Possible Clues:

• "Aaay!" sayer of '70s-'80s TV
• Winkler role, with 'the'
• ''Happy Days'' character
• Character who literally 'jumped the shark'
• Epitome of cool, with 'the'
• TV character who jumped the shark, with 'the'
• 1970's TV character whose real first name was Arthur, with 'the'
• Henry Winkler role, with “the”
• Macho sitcom guy
• Coolest sitcom guy