He disguises himself as a human child named Lex in order to dupe an adventurer into retrieving his lost toys for his children. After the adventurer obtains the toys, he reveals himself as a vampyre, much to the adventurer's annoyance, but gives them some rewards as a sign of gratitude before leaving.
Because he hails from House Jovkai, Alexei appears to be considerably nicer, but most likely shows a ruthless side behind closed doors.