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.
Someone who always keeps his promises could be called reliable, trustworthy or dependable.
A person who always lies is called a liar.
a white person
Lucky.
Wife..
cheater
a person who is always in a good mood is called jolly, or enthusiastic
Happy or a very lighthearted person.
I would call them a commentator
electrician!
Drummer.
informative
tube