The Two

The two are the companions Seranas and Durnehviir whom joined the trio during the second session of the Lost Mine of Phandelver campaign, thus making the Original Party. It is believed that the two characters (possibly even the two players) had a romantic relationship going on, though this has never been confirmed.
They both helped each other in castrating their fellow adventurer Gogdor during the Cragmaw Castle altercation.