Who are the main charecters in "The book of three" by:lloyd Alexander?10 points!?

I realy need to no this information but can't find it any were on the internet. i have tried book rags example essays and all of that stuff but nothin? so i begg u people to anser my question who are the main charecters in "The book of three". and description of each please. 10 points and thumbs up! oh and excuse my typos im in a rush.