Not necessarily a biblical angel but anything that fits the moniker of a divine emissary.
Not looking for a specific plot. It can be the classic angel dutifully following their mission to protect and guide mortals, a fallen angel rebelling against their Creator and their charge or an angel on the edge questioning their role and the worthiness of the humans.
Sharon Shinn’s Samaria series probably fits the bill. Romance sci-fi where genetically altered winged angels watch over and intercede for humans and find love along the way.
I love this series. It’s delicately written rather than being in your face.
The Angel of the Crows by Katherine Addison
Came here to recommend this! It's one of my favourite versions of Sherlock Holmes; super creative and fun.
This was gonna be my suggestion too :)
Nghi Vo’s The City of Glass has two main characters – a demon and an angel, of course. While the demon is the POV/lead, both are strongly characterized and thoroughly explored. The story is about their relationship with each other and really more deeply about their relationship(s) with the city
LOVED this book!!
Tad Williams' Bobby Dollar series, the main character is an angel.
https://urbanfantasy.fandom.com/wiki/Bobby_Dollar_series
Definitely this. It's one of those series that I've read multiple times (and still think "ooh, I want to read that again" every time someone mentions it) because it's so good. It's also the single best example of first person point of view that I've ever read.
When The Angels Left the Old Country by Sacha Lamb
Small Miracles by Olivia Atwater
Loved When The Angels Left the Old Country! It's got a distinct vibe, but would highly recommend.
Between two fires by Christopher buehlman has angels. One of the main characters could arguably be an angel or at the very least very in touch with the divine.
Daughter of smoke and bone by Laini Taylor might fit. Wings of Steel and Fury by Sarah J Daley, too
Seconding daughter of smoke and bone. The angel isn’t the main character in that book, but I think he is in ont of the other books in the series.
He's not the main MC, but you do get chapters from his perspective in Daughter of Smoke and Bone.
I have:
Laini Taylor's Daughter of Smoke and Bone trilogy, the second book really gets into the angels, but they appear in the first too.
Her Strange the Dreamer duology also features angels.
There’s the Angels Before Man series by Rafael Nicolas if you don’t mind a lot of (mostly toxic) romance and interpersonal drama in your fantasy. POV in the first book is Lucifer but following books and short stories have other angel and demon POVs.
Madeline L’Engle’s A Wind in the Door has a cherubim character, and A Swiftly Tilting Planet, the next book, has a divine messenger unicorn as a major character.
Old school, but Weis & Hickman's Rose of the Prophet has several immortals in its ensemble cast.
The cosmology is that the gods have a bunch of immortal servants, and each gods' servants fit their aesthetic. So one god has angels, another has demigods, another has djinn. Of the viewpoint characters, there are two djinn and a guardian angel. The guardian angel is one of the less important characters, but Pukah the djinn is one of the mor3 important ones, and probably meets the "angel-like" descriptor.
I came in here to recommend this one. I used to devour Weiss and Hickman books as a teenager and this trilogy is my favorite of theirs
The Dragon and the Unicorn. A.A. Attanasio. Real good stuff check it out.
Angelfall trilogy by Susan Ee - I enjoyed it
The Screwtape Letters by CS Lewis may appeal to you.
The characters are two demons (a junior and a mentor) writing letters to one another as they seek to tempt a human into sin and damnation. There is no plot per se, it's very much a frame device for intellectual and theological arguments around biblical concepts of God, human nature, and salvation in a Christian tradition. The demons themselves are presented as fallen, twisted angels (like the classic Lucifer).
It's actually a really great book.
It is very much written by a Christian, but provocatively and thoughtfully in ways that can be appreciated by people who don't share the Christian faith (including those with religious baggage and/or those with relatively little personal familiarity).
Neil Gaiman's Neverwhere has an angel as one of the major characters.
Gaiman & Pratchett's Good Omens has an angel main character.
Note, great stories, but research Gaiman before deciding whither you want to devote $ and/or time to him.
Alan Campbell, Deepwater Codex series
I'd second the Sharon Shinn books.
But as Sharon has already been recommended, I'd add the Guild Hunter series: https://www.goodreads.com/series/47942-guild-hunter
It's an urban fantasy where three species (angels, humans and vampires) have evolved together: Angels are immortal and a small number of Archangels rule the world divided into territories. Angels do not interact with humans - humans see the shadows as they fly overhead - they are incomprehensibly powerful and above all dangerous to mortals.
Vampires are strong and semi immortal (can be killed but grown in strength with age and can be a couple of thousand years old). Their role is to serve the angels and occasionally go rogue attacking humans. Any human can apply to be turned into a vampire and then enter the service of an angel.
The humans live their short lives mostly as we do, with some humans being members of guilds who hunt down and capture or kill rogue vampires.
The series is about one hunter who comes into the orbit of an Archangel and increasingly becomes part of that world.
It's very much a paranormal romance - but the world building is great, the society complex and interesting, and at least the first dozen or so books (a main plot arc is resolved in book seven and another in book 12 - the books are more stand alone/a little slower after that) are worth reading IMO. I think book 18 is intended to be the last one in the series releasing later this year
Of Blood and Bone by John Gwyenne
Unearthly by Cynthia Hand
Meljean Brook's The Guardians series. Nalini Singh has a take as well.
The Remy Chandler series follows an angel who lives as a mortal and is a P.I. He was an angel that stayed loyal during the fall but grew to appreciate humans over time and live among them (I think, its been a while since I read them)
Aliette de Bodard’s Dominion of the Fallen books, starting with House of Shattered Wings.
To Reign in Hell by Steven Brust (of Vlad Taltos fame) - a retelling of the fall of Lucifer, who led the revolt of the angels
Living the Good Death - A young woman who believes she is Death trapped in human form finds herself locked in an asylum after attempting suicide to cross back to the other side. Hilarity (dark humor) ensues.
Out of the Drowning Deep by A.C. Wise has two angel characters. It's a weird but AMAZING futuristic science fantasy cosmic horror novella.
'This Present Darkness' is quite a famous one. Very strong Christian messaging, very much biblical angels. Skip if that's not your thing.
More urban modern fantasy, but Demon Accords by John Conroe. Whether the angel(s) fit your definition of Angel is up for debate though! It would fit all parts of your post, and so much more. Gets more and more out there as the series progresses.
Battle of the Apocalypse by Eduardo Spohr
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I would love to recommend The Maker's Song series by Adrian Phoenix, but she wrote 6 of the 7, and never finished/published the 7th book, so it's maddeningly incomplete.
In Witchmark by C. L. Polk, an angel is the second main-est character.
Lamb: The Gospel According to Biff Christ’s Childhood Friend. Very funny and an adventure
Angels before Man by Rafael Nicoles. It's a retelling of lead up to the fall of Satan from Lucifer's perspective.
Older but the Remy Chandler series by Thomas E. Sniegoski
Small Miracles by Olivia Atwater
If you’re open to young adult fiction, the Daugjter of smoke and bone trilogy by Latino Taylor is fantastic. Especially the audiobooks.
The Dirty Streets of Heaven, Tad Williams