There are many reasons, in my experience. Often because they are just nervous, or naturally chatty and outgoing. Unfortunately there are some people who consider themselves to be more important and talk over others. Also people with anxiety disorders do it because they are agitated.
Jabber jaw, verbose, talkaholic, motor mouth , , ,
garrulous, voluble
umm by phone or if the question is meant to be (waht do you call a person with a lot of money) that answer is rich
contrary
A narcoleptic person; a person with narcolepsy.
That would be either forgetful or absentminded.
Outspoken?
talkative
A person who speaks many languages is often called a polyglot.
mithbhasi
That would be a disciple.
eugoogalizer
That would be a disciple.
a linguist
Pretentious.
profound or sentimental
That could be an 'orator' or 'lecturer' .
A native English speaker.
A person who is fluent in many languages is often referred to as a polyglot.