How would you start off an introduction on a report about a classmate?

Write the main part of the presentation, or paper, and come up with the introduction last. Intros usually have something to grab the audience's attention. If there is something your classmate has done that stands out or is shocking, use that as the attention grabber. Then go into the rest of your intro to explain that the fact you just gave is only the tip of the iceberg. That's the best I can tell you with the info you gave. Good luck.