The Under Taker was humanoid in shape and posture, though much smaller than human beings in height. They also walked with a slouched body, and posessed long arms. The Under Taker was designed to be much faster and agile than humans. Other than these traits their non-human nature could also be betrayed upon attack, hooting like monkeys, and shrieking when killed before dissolving into nothing.
Contrary to B.O.W. products like the Hunter, the Under Taker was noticably more intelligent, understanding the English language enough that they could receive live orders from their commanders. As they were designed as soldiers rather than simple weapons, the Under Taker was also able to use firearms with a degree of accuracy.
Despite their positive traits, the Under Taker was itself weaker than humans - even zombies. To counter this weakness, Under Takers would band together in groups to overpower enemies.[note 1]