[Ridureyu]

I think it appears that Imaginary Friends are essentially created from very, very simple concepts. While it is possible that some might be able to emotionally mature, it's not only very difficult, but impossible in many cases - for example, try as he might, Mr. Herriman always reverts to his basic uptight state. This new friend, similar to Berry, is an example of what happens when a friend is created from a particularly Strong emotion or concept, and is not provided with what it needs to finish developing itself. Thus, loneliness becomes possessiveness and violence, just as Herriman's regard for the rules becomes OCD-level insanity, or Bloo's personality becomes nearly-solipsistic selfishness. Essentially, the toybox face and Herriman are very similar, only they are different kinds of extremes. Both of them are dangerous in their own way, but imagine if, say, one with Berry's level of problems had the new friend's abilities.

Kind of disturbing, isn't it?