 Makura is the name of a Deva of the West, symbolized by the monkey.  Makuramons shapeshifting powers are a wink of sort towards Kong,  the Monkey King of the Chinese "Journey Westward" which was  inspiration of shows like Dragonball, Monkey Magic, and few others.  Makuramons roles were from Kaorwu/Tabris of Evangelion, pretty much  to fit in with the kids to further his own plans. Mush censoring was  used in this episode, especially to the Tokyo Capital Building,  where Hypnos is located, after Makuramon overloaded the Hypnos  mainframe (episode 3.23 "A World Apart").