Does Kwan Yin hold a place in Theravada Buddhism?
Kwan Yin wasn't taught by the Buddha in the Pali suttas and I'm certain Kwan Yin isn't mentioned in the Pali commentaries. Usually the teachers in the Theravada tradition strictly base how they teach on the Pali Canon but a lot of times they aren't so strict. There are Theravada teachers that are more like Mahayana teachers and Mahayana teachers that are more like Theravada teachers. In the end, the tradition one chooses isn't as important as the teacher one chooses.