Your question is too broad to be answered as written, as the nature of the defense depends upon the cause of action asserted by the Plaintiff.
They represent the plaintiff in civil cases against the defendant/respondant.
In a criminal case it is the accuser. In a civil case - think Judge Judy - it is the Plaintiff
the plaintiff, that is the person filing the complaint against you.
A plaintiff initiates a lawsuit against a defendant.
Defendant. He has to defend him self against the plaintiff's accusation.
An affirmative defense in civil law is when the defendant presents new evidence or arguments to counter the plaintiff's claims. This type of defense differs from other defenses, like denial or justification, because it requires the defendant to prove their own version of events rather than simply refuting the plaintiff's allegations.
The sides in a civil trial are the same as a criminal trial. There is a plaintiff and a defendant. In a criminal trial the plaintiff is usually the jurisdictioni charging the defendant.
The party who initiates a civil suit is the plaintiff, this is the person who filed the complaint against you.
In a civil case, the plaintiff is the party who starts the proceedings by filing a complaint against the defendant.
the "PLAINTIFF" is the person or party that brings suit against the "DEFENDANT." The term "plaintiff" is applicable only when referring to civil lawsuits otherwise (in criminal law) the plaintiff is referred to as the "PROSECUTION."
An affirmative defense in civil cases is a legal argument raised by the defendant to counter or justify their actions. It shifts the burden of proof to the defendant to prove their defense, rather than the plaintiff having to prove their case. This defense can help the defendant avoid liability or reduce the damages awarded in a civil case.
the person who files against you. the complainant