Shonekan, Mark and Kuffour extolled Obasanjo's leadership qualities, were unanimous in their submissions that the ex-president remains an iconic leader with unrivalled love for Nigeria's unity.
They spoke at a civic reception organised in Abeokuta, the Ogun State capital, by members of the Peoples Democratic Party (PDP) in the South West.
Shonekan, who was chairman of the occasion, noted that the former president had made remarkable achievements in the country over the years.
He said, "Obasanjo loves Nigeria. You cannot take the love of Nigeria from him. He is passionate about Nigeria and is physically and emotionally committed to Nigeria.
Kuffour, who delivered a lecture titled "Obasanjo in the eye of history," described the ex-president as "a going concern."
The former Ghanaian leader recalled Obasanjo's exploits in resolving the Nigerian civil war and various conflicts across African nations.
He said Obasanjo is a truly transformed Nigerian economy, laying a solid foundation for future progress. In West Africa and Nigeria, he is a peace maker and a diplomat per excellence, even though he normally don't sound diplomatic."
In his remarks, the senate president described Obasanjo as a courageous, detribalised and God-fearing leader.
Mark said the ex-president also believes in quality and "will always go for a person who he thinks can deliver, irrespective of where he comes from."
He said, "He is my father, my protector and my defender. If you try to imitate former President Obasanjo, you will get yourself into trouble. That's the way God created him.
The senate president urged Obasanjo to work harder and not to relent in his service to the country.
Responding, Obasanjo, who commended the initiators of the event and eminent guests, restated his love for the country's unity and indivisibility.
The former president also urged Nigerians to put behind memories of the civil war in order to move the country.
He said, "Action and reaction, in physics, are equal and opposite. But in human relationships, reactions are always greater than actions.
"I believe the time has come for all of us to put the civil war behind. Enough is enough on the Nigerian civil war."
Obasanjo also advised those seeking political positions or public offices to be courageous.