
Wind and Truth
Brandon Sanderson
Characters who exist in moral ambiguity, neither purely good nor evil, with complex motivations and dark choices.
133 books with this trope
Morally gray love interests run the genre right now. Readers want characters who have done bad things, might do them again, and aren't sorry about most of it. The clean-cut hero is out. The assassin who only kills people who deserve it, the crime lord with one rule, the dark prince who keeps his promises even when they cost him, that's what's selling.

Brandon Sanderson

M.L. Wang

V.E. Schwab

Rebecca Yarros

Amber Nicole

R.F. Kuang

Robin Hobb

Sarah J. Maas
The Dawn of the Cursed Queen
Amber Nicole
Amber Nicole

Carissa Broadbent

Mark Lawrence

R.F. Kuang

Laura Thalassa

Joe Abercrombie

Frank Herbert

Robin Hobb

Robin Hobb

Robin Hobb

Kerri Maniscalco

A.K. Caggiano

Mark Lawrence

Fonda Lee

Fonda Lee

Shelley Parker-Chan

R.F. Kuang

Penelope Douglas

Joe Abercrombie

Joe Abercrombie

Terry Pratchett

Robin Hobb

Tamora Pierce

Holly Black

J.R. Ward

S.A. Chakraborty

Jennifer L. Armentrout

S.A. Chakraborty

Fonda Lee

Rebecca Roanhorse

Pepper Winters

Joe Abercrombie

Joe Abercrombie

Terry Pratchett

Robin Hobb
The Blood Traitor
Lynette Noni
Lynette Noni

Holly Black

Joe Abercrombie

Elizabeth May

A.K. Caggiano

Stacia Stark

Holly Black
Storm of Secrets and Sorrow
Mai Corland
Mai Corland

Xiran Jay Zhao

Penn Cole
House of Beating Wings
Olivia Wildenstein
Olivia Wildenstein

Kristen Ciccarelli

Cassandra Clare

Anne Bishop

Sabaa Tahir

N.K. Jemisin

Martha Wells

Kitty Thomas

V.E. Schwab

Joe Abercrombie

Frank Herbert

Joe Abercrombie

Joe Abercrombie

Terry Pratchett

Terry Pratchett

Robin Hobb

Jay Kristoff

Hafsah Faizal
Fate of the Sun King
Nisha J. Tuli
Nisha J. Tuli

Sarah J. Maas

Leigh Bardugo

C.N. Crawford
A Queen This Fierce and Deadly
Stacia Stark
Stacia Stark
Songbird of the Sorrows
Braidee Otto
Braidee Otto

A.K. Caggiano
A Kingdom This Cursed and Empty
Stacia Stark
Stacia Stark

Mai Corland

Dani Francis
Dawn of Chaos and Fury
Melissa K. Roehrich
Melissa K. Roehrich

K.A. Tucker

Renee Ahdieh
A Cage of Crimson
K.F. Breene
K.F. Breene

Abigail Owen

Margaret Owen

Nghi Vo

Joe Abercrombie

Jay Kristoff
The Rebel King
Gina L. Maxwell
Gina L. Maxwell

Julie Soto
A Vow in Vengeance
Jaclyn Rodriguez
Jaclyn Rodriguez
A Fate So Cruel
J.E. Reed
J.E. Reed

Bec McMaster

Stephanie Garber

Julie C. Dao

Holly Renee
Queen of Chaos
Amelia Hutchins
Amelia Hutchins

Victoria Aveyard

Jennifer Estep

Sarah Hawley

Natasha Ngan

James S.A. Corey

Victoria Aveyard

Joe Abercrombie
Her Hidden Fire
Cliodhna O'Sullivan
Cliodhna O'Sullivan

K.J. Sutton

Kate Golden

C.N. Crawford

C.S. Pacat

Natasha Ngan

Victoria Aveyard

Lev Grossman
The Wretched Divine
Adalyn Grace
Adalyn Grace

Hannah Nicole Maehrer

Sara Hashem

Hannah Nicole Maehrer
Ruinous Creatures
Jessi Cole Jackson
Jessi Cole Jackson

Emily Lloyd-Jones

Claire Legrand

Kate Golden

Holly Black

Shelby Mahurin
Court of the Undying Seasons
A.M. Strickland
A.M. Strickland

Hannah Whitten

Hannah Whitten

Lexi Ryan

Rory Power

Rory Power

H.D. Carlton

H.D. Carlton

K.A. Knight
Morally gray works because choice has weight. A pure hero doing the right thing is expected. A character who has every reason to be selfish, every excuse to be cruel, choosing kindness anyway means more. The romance hits harder because it's not love at first sight, it's love despite everything they've seen. Cardan from The Folk of the Air is a near-perfect example. Rhysand from ACOTAR. Xaden from Fourth Wing. They're not heroes. They become them, partially, sometimes, and only for one person.
The genre has a problem with calling characters morally gray when they're actually just rude. A grumpy guy who hasn't done anything truly bad isn't morally gray. He's grumpy. The trope requires actual moral compromise, real victims, decisions the character has to live with. The best morally gray love interests have backstories that make you uncomfortable. The reader should occasionally wonder if the protagonist is making a mistake.
The Cruel Prince introduces Cardan, the gold standard. ACOMAF reframes Rhysand as a court politician who survives by appearing worse than he is. Vicious by V.E. Schwab takes it further with two protagonists who are both villains. Six of Crows builds an entire crew of morally gray crooks and dares you to root for them. Start with whichever fits your tolerance for darkness.