Ryujin
Legend
It felt like they didn't want to have to pay for the CGI of Momo so he really wasn't there, until he was. When he's not being specifically used he isn't even in the background. He's just gone.But . . . Momo got shafted! Very little screen time, you almost forgot he was there until suddenly he was! Really well realized in CGI, he looked REAL, as did Appa and the many weird animals of the Avatar world.