Main Characters:
- Ursula Riggs (Ugly Girl) In the beginning of the book Ursula was known as ugly girl and the girl who only liked sports and winning, she was a shy girl who hope never to be noticed in the halls. Through out the book she become "friends" with Matt Donaghy a popular class clown. Ursula and Matt become friends through chatting with one another about the misunderstanding of the bomb threat and became closer and closer towards the end of the book where Matt starts to like Ursula more as a friend.
- Matt Donaghy (Big Mouth) A popular class clown who attended Rocky River and had a reputation for being brainy and a comic character. He was secretly a perfectionist. Matt was wrongly accused of a bomb threat and was taken out of school for 3 days, soon after the accusing he realized who his true friends were and who was really by his side.
- Reverend Brewer ( twins dad) was the twins father who called Rocky River school and told on Matt. At the end of the book Reverend Brewer called Rocky River schools office and said, "This time I'm doing the job right." He was trying to act as if he were Matt and to get him into trouble considering Matt got the twins kicked out of school, little did Reverend Brewer know Matt was in class at the time so there was no possible way Matt could have called.
- Muriel and Miriam Brewer (twins) They were the two Twins who attended Rocky River school who reported Matt to their father who went to the school office. The two twins heard Matt joking about bombing but knew it as a joke but still reported Matt. Soon after being found guilty in lying about Matt they got kicked out of school which triggered their father to get revenge.
- Trevor Cassity (popular jock) was one of Matt s good friends until the rumor stormed about Matt threatening to bomb the school. Trevor was no longer wanting to involve himself with Matt. Towards the end of the book Trevor took Pumpkin Matt's dog trying to make Matt mad, Trevor turned against Matt and no longer were friends.