Just as the topic says.  The special hirelings that come to the stronghold do not appear in my hireling list.  That is unfortunate, as I have missed out on three of them thus far.

Same here unfortunately.  I've got one of the wandering hirelings but recently received a message that another one Dunryd Psion showed up.  However, he is not showing up anywhere in my hireling list.  I've restarted the game but still nothing.