Please be warned if you haven't read these books these sections contain plot-spoilers.
Plot Summary: Alanna once again leaves and; this time, in search of the Dominion Jewel, to bring back to Tortall and to prove herself as a true knight. She comes across new friends who help her along her journey such as the Shang Dragon Liam, Princess Thayet of Sarain and her loyal bodyguard, Buriram Tourakom. But while successful in her quest to gift her homeland with the Jewel, bad news greet her: Jonathan is now King of Tortall, and her archenemy; Roger of Conté, has risen from the dead.
Alanna of Trebond & Olau - Heroine and focus of the book/series
Jonathan of Conté - Prince and heir of Tortall and Alanna's best friend and old lover.
Gareth of Naxen the Younger - one of Alanna's friends, has succeeded his father.
Raoul of Goldenlake - Another one of Alanna's friends, and commander of the King's Own.
Alex of Tirragen - Yet another friend of Alanna's, who is as secretive as ever and a suspected worker for the Duke of Conté.
George Cooper - The King of the Thieves who waits for Alanna's return and becomes her betrothed at the end of the story.
Thom of Trebond - Alanna's twin brother who resurrects Roger to "prove" he is the most powerful mage.
Roger of Conté - Jonathan's treacherous and powerful sorcerer cousin who Alanna killed and Thom resurrects.
Liam the Shang Dragon - a master at martial arts who befriends Alanna and becomes her lover.
Princess Thayet jian Wilima - a K'mir Princess of Sarain, the most beautiful woman in the world, flees war torn Sarain accompaning Alanna to Tortall marries Jonathan of Conté.
Buriram Tourakom - Thayet's maidservant and guard, a K'mir tribeswoman.
Princess Josiane of the Copper Isles - Jon's mother's hopeful betrothal for her son, a traitor conspiring with Roger.
Delia of Eldorne - Roger former lover and aids in his plot to take over the Tortallen throne.
Si-cham - Priest of the Mithran Order who tries to help Thom overcome his illness.
Rispah - Queen of the Rogue. George's cousin. Marries Coram.
Myles of Olau - Alanna's adoptive father and a knight of the realm of Tortall.
Eleni Cooper - George's mother. Falls in love and marries Myles of Olau.
Faithful - Alanna's cat and goddess sent guardian. The supernatural cat has violet eyes, much like his mistress, and has an uncanny sense for detecting the characters of others, and also proves useful in warning Alanna in times of danger.
Info from: Wikipedia