Here´s what you have to do:

find out information about the character your teacher will tell you; you will find a list of all of them below;
give a characterization;
find out what the name means (here you might need an English, an old English and maybe a Latin dictionary);
make a drawing for the classroom wall;

You should be able to explain the character and to show the class a drawing of whatever person or animal or place you have to describe!
You will be working on the subject for two lessons in the computer room at school, any extra work will take place at home.

Diagon Alley

Hogsmeade

Hogwarts

Quidditch

Gryffindor

Slytherin

Hufflepuff

Ravenclaw

The Dursleys

Ron Weasley

Neville

Rubeus Hagrid

Albus Dumbledore

Professor Minerva McGonagall

Professor Severus Snape

Things you need for wizardry and other magic items

Madam Irma Pince, Arthur Weasley

Professor Binns, Peeves

Cornelius Fudge

Hedwig

Draco Malfoy

Madam Hooch, Madam Pomfrey

Argus Filch and Mrs Norris

Lord Voldemort

Fred and George Weasley

Hermione Granger