The character was named after the late Mako Iwamatsu , the original voice of Iroh in Avatar : The Last Airbender .
The final design for Mako was done by supervising producer Ki - Hyun Ryu .
The character was named after the late Mako   , the original voice of Iroh in Avatar : The Last Airbender .
The final design for Mako was done by supervising producer Ki - Hyun Ryu .