There are two roles on mock trial: witnesses and attorneys.
As a witness, you will portray a character. These characters will vary from accused murderers to quirky talent agents to state medical examiners. You’ll both prepare a question-and-answer with an attorney from your own team to get out facts that are good for your side (direct examinations) and prepare for an unfriendly questioning from the other team’s attorney where you’ll have to fend off questions about information that’s bad for your side (cross examinations). People who enjoy acting and making up characters will enjoy witnessing.
As a lawyer, you’ll prepare direct examinations with a witness on your team as well as cross-examinations to question witnesses from other teams. You might also give a statement, which is a speech where you’ll explain the facts of your case and why your client has won. Attorneys also participate in impromptu objection battles using case law and rules of evidence to disrupt opposing attorneys’ examinations or protect your own. People who like public speaking and debate will enjoy attorneying.