From the Super Mario Wiki
“Job of Monzo really lame.”
Monzo is the cameraman of Flint Cragley Cragtrotter. He is partners with Hornfels and is one of Flint Cragley's crew. He is smaller than Hornfels and is yellow skinned. He does everything that Flint tells him to do and follows him everywhere.
During the game, Super Paper Mario, Flint and the crew are filming an episode in the Floro Caverns and Flint tells Monzo to stay where he was. Monzo did so, but as time went, nothing happened. After a while, Mario and the two other heroes as well as the Pixls tell Monzo where Flint had gone (and that Flint had forgot about him).
After that, Flint blames Monzo and Hornfels for losing the key that led deeper into the Floro Caverns. As it turns out, Flint had the key in his pockets (it was there all along but he said it appeared by magic) and said to continue on their quest. Even after that, Monzo works with Flint.
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