Cannith Artificer - A somewhat sheltered girl who grew up more around Warforged than real humans, hidden away by her parents most of the time. However, her father insisted that she join in on the Last War on the front lines. Of course as a Cannith heir, she was suppose to have been mostly safe from combat, this was not always the case. Whether by luck or skill, she was able to survive, and became an honored member of the unit she was a part of. There's some craziness behind all of this, that I'd get into in chatting about this idea.
Deneith Heir - Born in Karnnath, the daughter of Regent Moranna ir'Wynarn. A half-vampire Deneith Dread Necromancer (or Thief of Life), who knows her mother, and great great grandfather King Kaius' story, and wishes to help Karnnath against her Deneith father's wishes.
Lyrandar Heir - Dragonmarked Lieutenant on a small, but super fast airship. Swashbuckling type of story most likely, during the Last War, or perhaps on a voyage to Xen'drik for a wealthy benefactor of some kind.
Thuranni Assassin - Born in Sharn, this beautiful heiress to the Baron Elar d'Thuranni was approached at an early age by the Blood of Vol. A Spellthief/Thief of Life, she's been known to steal the soul from those men and women who don't take her seriously. With a literal shadow as her companion/symbiote, this strong young woman seems to have plans of her own for the House.
Vadalis Beastmaster - Born in the Eldeen Reaches, introduced to the Gatekeeper and Warden of the Woods Druid sects, this young girl was also awed by arcane magic in the form of an older member of her family. As she grew older, she combined her loves of nature, animals, and arcane magic into that of an Arcane Hierophant. From then on her Animal Companion and Familiar were one creature, a male wolf she'd raised from a pup to be her best friend. This of course has the potential for lots of bestiality overtones, though I don't absolutely have to have this be part of the story.