Hi Aarroy,
Who is your favorite fictional character? It doesn't have to be someone from a classic novel unless your teacher specified. It can be a character from a movie you love etc.
In order to write a "descriptive" paragraph, all you have to do is describe the character you choose using vivid language. For instance, if I was writing about Darcy from Pride and Prejudice I could write;
<em>"He has silvery blue eyes and an intimdating stature."</em> etc.
Just write about your character's appearance as well as his personality.
Metaphors are comparisons that do NOT use <u>like</u> or <u>as</u>. For instance, I could write:
<em>"Darcy's personality is an onion; with an outward appearance that first appears cold but whose inner layers reveal his insecure and fragile nature."</em>
I know that sounds like a mouthful, but I am comparing Darcy's personality to an onion without using like or as, which is a metpahor.