'Invite a Holy Men to the court') to create new random characters. If you want more characters, go to the intrigue menu and use the decisions (e.g. Claims can be checked by clicking on a character's portrait (they are shown one line above the owned titles, as COA with wide or thin green borders). Just make sure that they don't have any claims on your kingdom title (because in that case they are rather eager to plot against you). They are usually a bit more loyal thanks to their 'kin' opinion modifier. However, I don't see any problem with granting titles to other, more distant relatives from your own dynasty. with primogeniture succession all your sons are dead and you only have a daughter left).
The only way for a female characer to receive one is inheriting it with either true cognatic gender law (which is only for basque culture, iirc) or by agnatic-cognatic gender law if no eligible male character is left (e.g. Click to expand.You cannot grant female characters any titles.