You can use pronouns like “they” or even “he” or “she,” for agender, depending on what they prefer. The best way to know what pronouns to use for Agender individuals or any other gender, is to show respect for someone's identity and simply ask them what pronouns they prefer.  The most important thing in the selection of pronouns for the person you are talking to is to acknowledge that they don’t adhere to the identity you may be assuming about them, and to be aware of the fact alone is good enough when picking the pronouns you use for them.