Rosella (unofficial)

King's Quest II: Romancing the Stones
In the alternate unofficial KQ2+ timeline Rosella moved away from Daventry to live with Edgar, leaving Daventry without an Heir, forcing King Graham to choose Connor instead.

King's Quest II 1/2: Breast Intentions
In KQ2 1/4 Rosella will die if Valanice doesn't leave a couple of bottles of milk in Daventry for her.

King's Quest III: To Heir is Human VGA
In KQ3+ she is strong willed and convinces her father to sacrifice her to the dragon as seen in the Oracle's vision. She doesn't ask Alexander to show his birthmark and knows he is her brother.