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Imaginary playmates are quite common in children. The child's imagination is a wonderful tool for playing. An imaginary friend helps them explore social situations and face their fears. They may say that the imaginary friend is afraid of monsters, instead of saying that they are. The best thing to do is to go along with the child and pretend that the imaginary friend is real. Eventually, they will grow to the stage where they do not need them any more.
A pervert...
chatterbox
tattler.
Conversing with oneself is known as self-talk or inner dialogue. It is a common behavior that can help organize thoughts, problem-solve, or provide emotional support.
A perv A freak Or a George Lopez
Gothic
a teller
A chatterbox LOL
You would call the an acquaintance.
Such a person is called a chatterbox.
I would rather say that if the person talks about how intelligent they are then i for an adult call it conceded.