Mangjo is a citizen of Kaineng City and appears to be a long-time friend of Paoko. She randomly spawns along with Paoko and Raiyi. They simply engage in a friendly conversation that periodically repeats. The three of them, like Ling, do not appear to serve any specific purpose.
When spoken to, she uses the standard dialogue of Canthan Peasants.
The conversation is recorded in the corresponding section on Paoko.