Matt Murdock/ DareDevil

His for you: Angel

Well, as he was known as The Devil if Hell's Kitchen, he liked to think you balanced him out. You were his angel.

Yours for him: Slugger

You started calling him this when you first noticed the injuries he got. The name just stuck.

...

Johnny Storm/ Human Torch

His for you: Nerdy McCutie

Just like your contact name, Johnny liked to call you this.

Yours for him: Baby

Plain and simple.

...

Peter Quill/ Star Lord

His for you: Star Babe

He was Star Lord and you were his babe...

Yours for him: Star Dork

Again, he was Star Lord but he was also a huge dork. Rocket got a big raise whenever you called Peter Star Dork.

...

Wade Wilson/ Deadpool

His for you: Tiger

Wade always called you his little tiger. It kind of annoyed you but at the same time, you found it endearing.

Yours for him: Dumpling

It took you a long time for you to come up with something original to call him and Wade thought it was adorable.

...

Stephen Strange/ Doctor Strange

His for you: Sweetheart

Stephen wasn't really one for nicknames but he didn't mind calling you this.

Yours for him: Mister Doctor

You were with Stephen when someone asked for his name. The said "Mister...?" He said "Doctor." "Mister Doctor?" You thought it was hilarious so you started calling him that.

...

Gamora

Hers for you: Y/N

Gamora didn't really have a nickname for you. She was afraid that if she showed any sign of affection in front of others, someone will take advantage and steal you from her.

Yours for her: Love

This was something that you called her only in private. Like Gamora, you kept your relationship a secret from the rest of the world. The others on the ship were the only ones that knew about it.

...

Vision

His for you: Dear

Vision wanted to try giving you an affectionate nickname. After many failed attempts, this one stuck.

Yours for him: Gem

Vision was a total gem. He was so sweet, caring and patient with you.

...

Phil Coulson

His for you: Honey

It was a sweet term of endearment that you absolutely loved.

Yours for him: Doll

Phil just the cutest. To you, he was an absolute doll.

...

Sharon Carter/ Agent 13

Hers for you: Sweetie

It was a simple and cute way of showing her affection.

Yours for her: Darling

It was a classic term of endearment and you were a classic kind of girl.