The pronoun following a linking verb will always be the object in the sentence, therefore, use the object personal nouns [me / you / him / her / it / us / you / them]
Many important verbs do not express action; some verbs can link a noun or an adjective to the subject. This type of verb is called a linking verb. The linking verb connection between the subject to the noun or adjective is something like an equal sign. She is tall. -- She = tall.
Verbs that are sometimes used as linking verbs
[list may not be complete]
Forms of "to be" are sometimes used as linking verbs