Unlike personal pronouns, impersonal pronouns do not have different forms for each grammatical person. However, some have different forms that agree with the nouns they replace.
Adverbial pronouns – en, y
Replace a quantity or place.
Demonstrative pronouns – celui, celle, ceux, celles
Replace previously mentioned noun.
Impersonal subjects – ce, il
Introduce impersonal verb or expression.
Indefinite demonstrative pronouns – ce, ceci, cela, ça
Stand in for unknown noun.
Indefinite pronouns – autre, certains, plusieurs …
Indicate unspecific quantity or description.
Interrogative pronouns – qui, que, lequel
Ask who, what, or which one.
Negative pronouns – ne __ personne, ne __ rien …
Replace and negate a noun.
Possessive pronouns – mien, tienne, siens …
Replace and possess a noun.
Relative pronouns – qui, que, dont, où, lequel
Link clauses with an antecedent.
Indefinite relative pronouns – ce qui, ce que, ce dont, ce à quoi
Link clauses without an antecedent.