He is probably the Actual Grand Master of the Knights of Favonius in Monsdadt. Before the Traveler just visits Monsdadt for the first time, Varka along with some of the best members of the Knights of Favonius left on some urgent mission. In his absence, Jean is acting as a temporary Grand Master that’s why she is referred as ‘Acting’ Grand Master.
He is probably a claymore character, as Razor talks about him a bit in his voicelines. Varka taught Razor how to fight. There is not much information on him now. Maybe he will appear in future main story quests. Lets wait and watch.