Please translate the following sentence from English to Russian.

Common characteristics of nouns, pronouns and adjectives.


I believe in this case the words nouns, pronouns and adjectives are used as adjectives, because they are modifying the word characteristics.
I think they would be in the genitive case, because of the word "of".

My question: the endings for nouns and adjectives have a gen. plural adjective ending, but the ending for the word pronoun is a masculine singular nominative adjective ending. This may be an exception, but by every adjective ending chart I've seen, this is the situation. This question is awkward because don't have my cyrillic letters on my keyboard yet, and I am anxious to get an answer to this question. Why the difference in the endings?