Are pronouns used as subjects or subject complements in the nominative case?

in the nominative case are used as .
Pronouns in the objective case are the ones used as subject complements.
Ex:

.She received a gift from him.
“She” is in the nominative case and is the subject of the sentence.

We gave them a grand reception.
“We” is in the nominative case and is the subject of the sentence.

The culprit is him .
“Him” is in the objective case and acts as predicate nominative or subject complement.
The victim here is me .
“Me” is in the objective case and acts as the predicate nominative or subject complement.
Personal Pronouns:
Subject Pronouns ——————- Object Pronouns
I —————– me
You —————– you
He —————– him
She —————– her
It —————- it
We —————- us
They —————- them
Note: Subjective and nominative case are the same.