The second eldest of the five Zaoldyeck brothers, he is notably overweight and a passionate otaku. Although he admits to being an assassin, suggesting he has combat training and is stronger than the average person, he is likely the weakest among his siblings.
Both he and his mother sustain injuries when Killua escapes from their house. Milluki excels in creating new types of weapons. He has only left the house twice, with his second outing being a trip to York Shin City to purchase Greed Island at an auction. However, this endeavor fails, leaving him disappointed as he returns home.
