Rosie is 's moth character who is also an explorer/cartographer. She occasionally brings (read: drags) Mochi on her expeditions because the latter is able to carry a lot of weight and Rosie could always use some extra hands and eyes. Unfortunately, Mochi tends to not do much other than complain during most of the trip - as seen here, where she's obviously not too happy about trekking all this way for some "stupid dumb ruins." Despite this, Mochi keeps going on these expeditions. Perhaps she secretly enjoys Rosie's company...Don't tell her I said that