Who Are the Main Characters in the Whistle-Blower’s Complaint?. Trump-Ukraine Whistle-blower Complaint and Impeachment Inquiry, Biden, Joseph R Jr, Trump, Donald J, Ukraine, Whistle-Blowers, Burisma Holdings Ltd, Biden, Hunter, Zelensky, Volodymyr, Giuliani, Rudolph W, Presidential Election of 2016, Presidential Election of 2020, Lutsenko, Yuri V