A weirdo! who is tired of remaining silent and feels the need to communicate somehow :-)
Someone who talks to themselves may be referred to as "self-talker" or "self-conversationalist." In psychology, this behavior can also be known as "soliloquy" or "self-talk."
If an actor/actress is talking to him/herself, it is a soliloquy. If they are talking to the audience, it is an aside.
Talk to them self and answer them self.
Schizophrenic
Arrogant!
A genius
I would rather say that if the person talks about how intelligent they are then i for an adult call it conceded.
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.
Gothic
a teller
A chatterbox LOL
Such a person is called a chatterbox.
cheater. when someone talks about hacks or glitches, that is like cheat
They are egotistic. Call them that
If he talks to u for no reason and tries to invite himself or looks at u!
A person who talks less in Hindi can be referred to as "chup" or "khamosh."