She has "precious little gift when it comes to actual combat magic".
Ancient Mai is Chinese and, as Harry Dresden describes her, she looks a delicate and frail as an eggshell teacup. She has long, granite-colored hair with jade combs holding it up. She still has a haunting, ethereal beauty, though old even by Council norms. Her eyes are dark, piercing and merciless.
In the series
In Proven Guilty, Carlos Ramirez informs Harry Dresden most of the Senior Council is unable to make it to Molly Carpenter's trial, granting the Merlin their votes by proxy. Ancient Mai is current in Indonesia and is not expected to return to Edinburgh. Along with the Merlin, she is suspected of being the traitor among the Council, as her whereabouts during many of the attacks are unaccounted for.
In White Night,Harry Dresden and Bob discuss Mouse's powers, like his bark. Bob explains Temple Dogs are sentinels that watch for dark energy and alert others to the presence of danger. Dresden notes this explaints why Ancient Mai made Temple Dog statues to assist Wardens with security.