In fact I also forgot another famous angel sent by Our Loving God before that at the end of 2 Samuel. Since it involved God killing thousands of innocent people naturally it slipped my mind.
God told David to take a census, so he did. Then God was furious that David took the census (hey, you try to make sense out of it!) and wants to punish David. Now when God talks about punishments to special people like David, He's not talking about punishing them. God has an interesting sense of justice. So God gives David the choice of three things that will cause unimaginable suffering to the innocent Chosen People of Israel who God loves more than anything and had no part in David's sin. See, you gotta dig how God thinks. Naturally David selects what sounds like the least severe which is exactly how devious God tricks people.
What David thought would be a mere three days of pestilence turned out to be three days of a murderous angel of death flying around and killing every person it sees. The toll after three days was 70,000 innocent lives killed. Of course we readers aren't supposed to dwell on these 70,000 human lives who were killed by the Lord because, hey. who cares about them? No, we're supposed to feel sorry for David because he feels bad about how large this number is.
An angel more like the kind we would imagine is in the beginning of 1 Kings. When Elijah is hiding out in the woods, God sends birds to feed him. When he had to hide out a second time (or third time, I've lost track), apparently the birds are too busy so God sends an angel to feed him instead.