Defendant. He has to defend him self against the plaintiff's accusation.
The person may be called a persuader, influencer or at best a counsellor as the case or situation may be. The person may render his service free or against service charges mutually settled.
Yes.
If you refering to what is the term for a person who is trying the state's case against the defendant, they are called the Prosecutor.Added: His opposite number in the courtroom, would be the Defense Attorney.
constitution
A Prosecutor
Petitioner
Petitioner
the person who files against you. the complainant
They are treasonous and are called traitors.
abolitionist.
The first person-singular nominative case personal pronoun is called "I."