The Other Monkey
From LGPedia
The Other Monkey is a stuffed animal of which Bree never speaks. Presumably, Bree does not love The Other Monkey. Daniel holds The Other Monkey in the video I Probably Shouldn't Post This...
It is unknown if The Other Monkey gets along with Thor, Owen and Purple Monkey. The Other Monkey is probably slightly insane from Bree's neglect and scorn.