Possible Clues:

• Character with the tagline 'Booyakasha!'
• HBO conductor of prank interviews
• Character who interviewed Newt Gingrich
• 'Indahouse' comedy character
• 'Is Disneyland part of the UN?' comedian
• Sacha Baron Cohen creation
• TV persona giving prank interviews
• TV character with the catchphrase 'Booyakasha!'
• 'Booyakasha' character
• "Brother" of Bruno and Borat