Someone who talks to an imaginary friend is often referred to as a person with an imaginary companion. This behavior is common in children and can be a part of healthy imaginative play. In adults, it might be seen as a sign of creativity or introspection, but it can also suggest loneliness or a need for companionship.
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...
tattler.
chatterbox
Gothic
A perv A freak Or a George Lopez
A chatterbox LOL
a teller
You would call the an acquaintance.
Such a person is called a chatterbox.
Loyal, trustworthy, a true friend.
I would rather say that if the person talks about how intelligent they are then i for an adult call it conceded.