There's no requirement for the accused to explain why he pleaded guilty. He may do so at sentencing.

My client may be a lot of things...but he is not a rapist. He has pleaded guilty to many other crimes he has been accused of, but he is prepared to fight this to the end.

It was a time in my life. I made a mistake. I pleaded guilty to it. I admitted to what my problems were. I paid my debt to society, and moved on.

He should have never plead guilty, we also think that the sentencing is too harsh.

Can someone please explain to me what that was all about?

Character witnesses are for when you're guilty and are looking for lenient sentencing.