Costia/Lexa (The 100) FanFiction

do not go gentle into that good night (rage, rage against the dying of the light)

do not go gentle into that good night (rage, rage against the dying of the light)

F/F
G
Updated
11.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin/Lexa, Clarke Griffin, Lexa (The 100), Indra (The 100), Anya (The 100), Titus (The 100), Costia/Lexa (The 100), Anya & Lexa (The 100), Lexa & Titus (The 100), Indra & Lexa (The 100), Costia (The 100)
Tags
Smut Fluff Angst Character Study Canon Compliant Flashbacks Introspection Suicidal Ideation like very canon-compliant i fear this isn't a fix-it it's like. what if lexa's death made more sense. Angst with a Bad Ending some secret unrevealed spoiler stuff
Because Lexa herself could never be youthful nor young, that courtesy was always denied. At birth, she was crowned in the colour of the cave, at infancy, pronounced a warrior. In time, she would absorb the soul of the Pramheda and those that came aft...
Running for president

Running for president

F/F
F/M
G
Updated
12.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin/Lexa, Clarke Griffin, Lexa (The 100), Octavia Blake, Bellamy Blake, Costia/Lexa (The 100), Costia (The 100), Raven Reyes
Clarke is an A-student with her mind focused on one goal, to become the schools president. The school year however doesn't start to well as she finds out that no other than Lexa Woods is running against her. Angst, jealousy and drama - say no more. T...
You Don’t Know What It’s Like

You Don’t Know What It’s Like

F/F
F/M
G
Updated
13.04.2025
Fandom
The 100 (TV) The 100 Series - Kass Morgan
Characters
Clarke Griffin/Lexa, Clarke Griffin, Lexa (The 100), Abby Griffin, Octavia Blake, Octavia Blake/Lincoln, Lincoln (The 100), Bellamy Blake, Luna (The 100), Finn Collins, Indra (The 100), Anya (The 100),
Tags
Alternate Universe - Modern Setting Slow Burn Futanari Girl Penis G!P Lexa g!p
I just want to go back to beforeWhen I didn’t know youAnd you didn’t hurt me... Clarke and Lexa are exes. This is the story of how they find their way back to each other. Clexa endgame. Slow-burn. Lexa g!p.
Princesses First, Mates Second

Princesses First, Mates Second

F/F
F/M
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin/Lexa, Clarke Griffin, Lexa (The 100), Abby Griffin, Clarke Griffin & Lexa, Niylah (The 100), Jake Griffin, Indra (The 100), Aden (The 100), Ontari (The 100), Nia | Ice Queen, Gustus (The 100),
Tags
Loss of Virginity Angst Mutual Pining Rough Sex Heavy Angst Angst with a Happy Ending Alpha/Beta/Omega Dynamics Childhood Friends Minor Character Death Underage Sex - Freeform Jealousy Arranged Marriage
Princesses Clarke and Lexa have been engaged since they were babies. But what happens when others get in the way of their love? Lexa has to choose if she should mate with another or to choose love. What does she choose? Her choices will affect the re...
I Will Break Your Heart

I Will Break Your Heart

F/F
F/M
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin/Lexa, Clarke Griffin, Lexa (The 100), Octavia Blake, Clarke Griffin & Lexa, Finn Collins, Costia/Lexa (The 100), Costia (The 100), Anya, Raven Reyes, Finn Collins/Clarke Griffin, maybe more
Tags
Alternate Universe - Modern Setting Angst Slow Burn Freeform idk - Freeform Clexa Endgame an out of order mess that will hopefully still make sense
The ups and downs of Clarke and Lexa's relationship. How they find their way back to each other after heartbreak.
My Best Friend's Wedding

My Best Friend's Wedding

F/F
F/M
M/M
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin/Lexa, Clarke Griffin, Lexa (The 100), Octavia Blake, Clarke Griffin & Lexa, Bellamy Blake, Costia/Lexa (The 100), Costia (The 100), Raven Reyes, Wells Jaha
Tags
Fluff Angst Drama Best Friends lots of fluff Lots of Angst
This, my friends, is a 'My Best Friend's Wedding' AU combined with our two favorite girls! Clarke Griffin is a very busy critic in NYC that gets a call from her long time best friend (that she's secretly in love with) telling her that she's getting m...
I crashed into you (and I went up in flames)

I crashed into you (and I went up in flames)

F/F
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin/Lexa, Lexa (The 100), Anya (The 100), Aden (The 100), Nia | Ice Queen, Gustus (The 100), Costia/Lexa (The 100), Costia (The 100), Nightbloods (The 100)
Lexa and Costia loved each other fiercely. Costia, being the free spirit she is, gives her over-protective Heda girlfriend an ulcer with her antics. The Ice-Nation wreaks havoc on Polis and all of the inhabitants of the other eleven clans. Working fo...
Fated

Fated

F/F
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin/Lexa, Clarke Griffin, Lexa (The 100), Abby Griffin, Bellamy Blake, Luna (The 100), Jake Griffin, Anya (The 100), Costia/Lexa (The 100), Costia (The 100), Raven Reyes, Clarke Griffin/Raven Reyes,
Tags
Loss of Virginity Angst with a Happy Ending Consensual Underage Sex Alpha/Beta/Omega Dynamics Alternate Universe - Soulmates True Mates True Love Alpha Lexa Omega Clarke Protective Lexa Girl Penis Lexa Jealous Lexa
Clarke and Lexa have been best friends since before they knew what true mates were. When will they realize their true connection? And are they really fated?
The Eighth

The Eighth

F/F
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Lexa (The 100), Costia/Lexa (The 100), Costia (The 100)
This is a bit different then my usual style because we know that Luna was the eighth nightblood and not Costia. But what if she was... Costia and Lexa from before the show starts. It takes place when Lexa becomes commander.
The Healer

The Healer

F/F
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin/Lexa, Clarke Griffin, Lexa (The 100), Abby Griffin, Octavia Blake, Clarke Griffin & Lexa, Lincoln (The 100), Finn Collins, Jake Griffin, Costia/Lexa (The 100), Octavia Blake/Raven Reyes, Raven Reyes,
Tags
Fluff Angst Slow Burn Mutual Pining Depression Character Death Angst with a Happy Ending Falling In Love Grief/Mourning Flashbacks Slow Build Car Accidents
AU! In which Clarke actually followed through with medical school and is a doctor. But when her friend Finn dies despite her efforts to save him, her faith in the medical field begins to crumble. As Clarke sorts through her feelings regarding Finn's...
You Know I'm No Good

You Know I'm No Good

F/F
G
Updated
13.04.2025
Fandom
The 100 (TV) The 100 Series - Kass Morgan
Characters
Clarke Griffin/Lexa, Clarke Griffin, Lexa (The 100), Octavia Blake, Bellamy Blake, Anya (The 100), Octavia Blake/Clarke Griffin, Costia/Lexa (The 100), Costia (The 100), Raven Reyes
Tags
Angst Eventual Happy Ending Slow Burn Eventual Smut Angst and Hurt/Comfort Drinking Minor Character Death Drug Use Cheating Flashbacks Jealousy Alcohol Abuse/Alcoholism
Clarke and Lexa are madly in love and together for 6 years when Lexa does the unthinkable. The couple breaks up and both are left shattered and heart broken.Lexa is hollywood’s golden girl and Clarke is an up and coming indie singer. They were the po...
The Story of Lexa (Brown Met Green, Green Met Blue)

The Story of Lexa (Brown Met Green, Green Met Blue)

F/F
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin/Lexa, Lexa (The 100), Luna (The 100), Indra (The 100), Anya (The 100), Titus (The 100), Gustus (The 100), Costia/Lexa (The 100), Costia (The 100), Costia & Lexa (The 100), Clarke Griffin/Lexa/Luna, Lexa/Luna (The 100),
Tags
Eventual Smut Prequel Clexa eventual clexa this is going to be very long lexa's pov it will take time but eventually clarke and lexa will happen no stray bullets here
Before Clarke there was Costia, before the coalition there was Lexa.The Story of Lexa follows the Heda through her training and first love, it shows the events and teachings which shaped a young girl into a woman.  [WARNING: This fic is going to be v...
Forgetting How to Breathe Isn't That Hard Boys

Forgetting How to Breathe Isn't That Hard Boys

F/F
M/M
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Lexa (The 100), Octavia Blake, Bellamy Blake, Niylah (The 100), Costia/Lexa (The 100), John Murphy, Bellamy Blake/John Murphy
Tags
Alternate Universe - Canon Divergence idk what this is Grounder!Murphy Bellamy crashes form space
For the anon tumblr Prompt:Murphamy with grounder murphy or modern au, maybe with some lexa?? Murphy being close to lexa like a little brother and lexa being protective cause she don't trust that bell really love him (but he does!!)
Settle Down With Me

Settle Down With Me

F/F
F/M
Multi
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Minor or Background Relationship(s), Clarke Griffin/Lexa, Clarke Griffin, Lexa (The 100), Abby Griffin, Octavia Blake, Clarke Griffin & Lexa, Lincoln (The 100), Bellamy Blake, Costia/Lexa (The 100), Costia (The 100), Monty Green,
Tags
Sexual Content Adoption Past Relationship(s) Alternate Universe I Don't Even Know Past Character Death Slow Burn Clarke Griffin/Lexa Alternate Universe - Photographer I Blame Tumblr Fine Stud Lexa kind of i mean yes and also no maid clarke
Clexa AU: Photographer!Lexa & Maid!Clarke."I never said I loved you, Clarke""You never said you didn't"
...And Then They Dream Of Love

...And Then They Dream Of Love

F/F
Multi
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin/Lexa, Clarke Griffin, Lexa (The 100), Costia/Lexa (The 100), Costia (The 100), Costia/Clarke Griffin/Lexa, Costia/Clarke Griffin
Tags
Angst Slow Burn Angst with a Happy Ending Fix-It Major Character Injury but also fluff
The Costia lives AU no-one asked for
Green Eyed Green Beret

Green Eyed Green Beret

F/F
F/M
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin/Lexa, Clarke Griffin, Lexa (The 100), Abby Griffin, Octavia Blake, Clarke Griffin & Lexa, Octavia Blake/Lincoln, Lincoln (The 100), Bellamy Blake, Anya (The 100), Costia/Lexa (The 100), Nyko (The 100),
Tags
Alternate Universe - Modern Setting Aftermath of Torture Alternate Universe - Military Army Marine Corps Women in the Military Anya & Lexa (The 100) Are Siblings Badass Lexa Soldier Lexa Dr. Clarke Griffin Eventual Clarke Griffin/Lexa Med Student Clarke
Clarke is working a few jobs. Burning the candle at both ends and in the middle as she goes through intern year at the hospital. A green eyed wonder comes into her gas station gig every other day to buy some ice. She can't get the sweaty girl out of...
The Future in Our Hands

The Future in Our Hands

F/F
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin, Lexa (The 100), Octavia Blake, Lincoln (The 100), Bellamy Blake, Indra (The 100), Anya (The 100), Costia/Lexa (The 100), Costia (The 100), Nyko (The 100), Raven Reyes
Tags
Angst with a Happy Ending Fix-It of Sorts Character Death Fix Flashbacks Minor Bellamy Blake/Clarke Griffin Protective Lexa Minor Octavia Blake/Lincoln Grounder Culture Anya Lives Mentor/Big Sister Anya Healer Costia (probably a happy ending maybe we'll see)
Costia and Anya are both still alive, and escaped from Mt. Weather with Clarke. With her people still in the mountain and an injured Anya stuck at Camp Jaha, Costia must work towards an alliance with Clarke and the Skai Kru if she wants to save her p...
Safe and Sound

Safe and Sound

F/F
G
Updated
13.04.2025
Fandom
The 100 (TV)
Characters
Clarke Griffin, Lexa (The 100), Octavia Blake, Bellamy Blake, John Murphy (The 100), Anya (The 100), Costia/Lexa (The 100), Costia (The 100), Monty Green, Raven Reyes, Nathan Miller, Clarke Griffin/Raven Reyes,
Tags
Werewolves Omega Verse Soulmate AU Alternate Universe - Daemons
Some one shots and others random story ideas with our favorite characters and(or) pairings.