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A person who helps a new worker learn a new position may be called a trainer, or, with a broader kind of help, a mentor.
The person is a blackmailer.
A person?
a person
You call that person a scholar.
You would call them someone who peruses.
an ally
You can call someone who does not lie honest, truthful, trustworthy, or sincere.
If someone tries to make you feel jealous.You must call that person a despo or a looser and a jerky person.
someone who works for a business
StromClock Ninja
What do you call a person that is presenting a gift to someone? I don't think "gifter" is a word.