In Philemon 1:16, Paul asks Philemon to have Onesimus back no longer as a slave but as what?

Answer: A beloved brother

Paul hopes Philemon will have Onesimus back "no longer as a slave, but better than a slave, as a beloved brother."

“no longer as a slave, but better than a slave, as a beloved brother. He is especially beloved to me, but even more so to you, both in person and in the Lord.”— Philemon 1:16 (BSB)