12. Nagasena, called in Chinese Wa'er Luohan, or

"The Ear Cleaning Arhat."

Nagasena means "Dragon Army" (so he is also called Long Jun in Chinese). He was considered to be a great teacher, and some think he was the speaker in the famous Buddhist book The Questions of King Milinda, in which he answers a king's questions regarding the Buddha's teaching.
So why is he cleaning his ear in almost every representation? Well, naturally, the only way to become a great teacher was to be a very good listener when the Buddha spoke! Remember, all of the Buddha's disciples are called shravakas or hearers, and Wa'er was among the best.