A Critic
A person was makes witty comments may be called a wit. (Note that wit is also an abstract noun).
A word that means harsh comments is ridicule. To ridicule is to make fun of a person in a mean or cruel way.
you call this person a "confidante"
She claims to love her brother, but she is always making derogatory comments about his family and career choice.
Usually you would call the person a reader.
a white person
A restless person.
Lucky.
Wife..
I would call them a commentator
Happy or a very lighthearted person.
a person who is always in a good mood is called jolly, or enthusiastic
Punctual. Employed.
Drummer.
electrician!
tube
informative