The IG-11 droid in "The Mandalorian" series is voiced by actor Taika Waititi. He not only provided the voice but also performed the motion capture for the character, bringing the droid to life. Waititi is a well-known actor, writer, and director who has worked on several notable films including "Thor: Ragnarok," "Jojo Rabbit," and "Hunt for the Wilderpeople." His comedic timing and unique voice were a perfect fit for the IG-11 droid, making it one of the most memorable characters of the series.