Badges

Science-fiction

Futuristic: books whose plot is based in the future

Space opera

Time travel: books that tell a journey through time

Steampunk

Dystopia

Apocalyptic

Urban fantasy

Paranormal: books with fantasy elements (that are not urban, epic or romance)

Magic: books where magic is a heavy player

Epic fantasy

Superhero: books of superheroes

Young adult

New adult

Terror or horror

Gore: books with a little extra in blood and guts

Dark: books that show the worst of the human nature

Mystery

Adventure

Historical

Regency: books about nobles from the Regency period

Ancient history: stories during the ancient times

Classical: stories during the classical period

Middle ages: stories during the middle ages

Contemporary

Romance (in general)

Contemporary romance

Sci-Fi romance

Romantic suspense

Paranormal romance

Historical romance

Erotica

Ménage: romance and erotica books with group sex

BDSM: books that disply BDSM practices

Rape: books where a rape takes place

Kidnap: romance books where one of the main characters is kidnapped by the other one

Cheating: books where a character cheats on their love ones

M/M: books that tell a love or sex relationship among men

Friends to lovers: romance books with friends falling in love

Enemies to lovers: books with enemies falling in love

Second chance: romance books were the main couple is taking another shot

Age gap: books (usually romance) where the age difference of the main characters is important for one or both of them

Faking: books (usually romance) where a couple fakes a relationship

Undercover: books where one or more of the characters goes undercover into some dangerous organization

Arranged marriage: books where the main couple is forced to get married

Secret kid: books (usually romance) where the characters discover they have a secret kid

Love triangle: books where there is a love triangle or even a polygon with more sizes

Warriors: books (usually romance) featuring warriors

Pirates: books (usually romance) featuring pirates

Highlanders: books (usually romance) featuring highlanders

Angels: books (usually romance) featuring angels

Demons: books (usually romance) featuring demons

Gods: books (usually romance) featuring gods

Vampires: books (usually romance) featuring vampires

Shifters: books (usually romance) featuring werewolves, weretigers, werebears…

Aliens: books (usually romance) featuring aliens

Cyborgs: books (usually romance) featuring cyborgs or enhanced humans

Sports: books (usually romance) featuring athletes

Students: books (usually romance) featuring college or high school students

Soldiers: books (usually romance) featuring soldiers

Rockers: books (usually romance) featuring any kind of musician

Racers: books (usually romance) featuring professional racers

Bikers: books (usually romance) featuring bikers

Fighters: books (usually romance) featuring professional fighters

Celebrities: books (usually romance) featuring somekind of celebrity not mentioned in previous categories

Bodyguards: books (usually romance) featuring bodyguards

Firefighters: books (usually romance) featuring firefighters

Detectives: books (usually romance) featuring cops or private detectives. Law enforcement in general

Doctors: books (usually romance) featuring doctors, nurses, paramedics or similar

Thieves | Con artists: books (usually romance) featuring thieves or con artists

Cowboys: books (usually romance) featuring cowboys

Businessmen: books (usually romance) featuring businessmen or businesswomen

Billionaires: books (usually romance) featuring billionaires

Royals: books (usually romance) featuring members of a royal family

Bad boy: romance books featuring the classic bad boy

Bully: romance books featuring bullies

Grumpy/Jerk: romance books where one of the main characters is the classic grumpy or jerk one

Ex-con: books (usually romance) featuring an ex-convict

Murderer: books (usually romance) featuring a murderer or psycopath

Mafia: books (usually romance) featuring mobsters and mafia-related characters

Criminals: books (usually romance) featuring any kind of criminal

Assassins: books (usually fantasy) featuring professional killers

Hitmen: books (usually contemporary) featuring professional killers

Escort: books (usually romance) featuring an escort

Stepbrother: romance and erotica books where the love interest is among stepbrothers

Single parent: books where one of the main characters is a single parent

Widow: romance and erotica books where one of the main characters is a widow

Boss/Employee: a book with a love/sex relationship between the boss and an emplyee

Teacher/Student: a book with a love/sex relationship between a teacher and a student

Anthology

Comic

Scary: any book that makes me feel fear

Cliffhanger: those  endings that give heart attacks to readers

First person: books written in first person

Nerd: most likely only suitable for nerds

Giveaway: book I won in a giveaway (which means I didn’t pick it)

Free: book that was free in Amazon, Bookfunnel or similar. This usually means that I only looked at the price tag, so… anything could happen

ARC: copy of the book given freely by the publisher or author in exchange of an honest review

Gold star: book that will always have a special place in my shelf

Teach: books that try to teach something while telling a story

Tears: books that make me cry (which is good)

Hot: books with really good love/sex scenes

Sweet: books with sweet moments between the characters

Book boyfriend: romance books with a guy that you would steal for yourself

Great cast: books where you will find great characters wherever you go

Frenzy: non-stop action that makes a book better

Funny: books that make me laugh

Great worldbuilding: books where a fictional world full of lore is created

Boom: books with a shocking twist

Nail biting: when you can’t set aside a book, no matter what

Great cover: books with a really good cover (review edition)

zZz: boring books

Weak: books that feel rushed and lazy

Lost: books where I get lost in the plot due to the author’s style

Bad style: when the author’s style annoys me

What?: those books that push hard to believe situations

Love?: strong romances that are hard to believe

Incest: just gross

Bad sex: sex scenes that make me uneasy

Angry: books that piss me off

Cliché: books with obvious clichés

Fumes: smoking is gross, so if a book has too much of it, its mark will be lower

Drugs: books where drug abuse is normalized. Say NO to drugs!

Bad cast: books where most of the characters are forgettable or a pain to read

Bad cover: books with really bad covers (review edition)

Burn: a bit drastic, but some books don’t deserve my shelf