Who is Miss Agatha Trunchbull from Matilda and what is their importance?

MISS JENNIFER HONEY WAS A PULITE & GOOD TEACHER WHO TEACHES MATILDA IN SCHOOL.SHE WAS A IMPORTANT CHARACTER IN MATILDA'S LIFE.& ONLY SHE HAS CARE ABOUT MATILDA.& FIRSTLY MISS HONEY KNOWS ABOUT MATILDA'S SPECIAL POWERS