That could be an 'orator' or 'lecturer' .
people who can speak 4 or more languages are commonly called, multilingual.
A person who speaks clearly is often referred to as articulate or eloquent.
A person who speaks a lot is often referred to as talkative or loquacious.
eugoogalizer
That would be a disciple.
talkative
A person who speaks and understands many languages can be called a polyglot.
A person who speaks out against something is often referred to as a critic, dissenter, or opponent.
Pretentious.
profound or sentimental
That would be a disciple.
a linguist