Three chapters in one day! Yay!! Also, I had to republish this because I forgot poor, sweet Bucky. Guys, if I forget someone, please tell me!

Tony

You are absolutely terrified of snakes. As in, you'll spot one and you scream. After your brother got bitten by a copperhead during a hike and had to go to the hospital, they paralyzed you.

Tony is terrified of his own mortality. He doesn't want to die, but he knows it'll happen, and he hates that.

Steve

You're horrified by mirrors at night. You're all too familiar with Bloody Mary and don't want to enact something. You avoided mirrors at night, or turned the lights on to pass them. It was a well-known fact, as even on missions, you would run when you saw an unlit room with mirrors.

Steve was afraid of losing you, so he didn't let your relationship go totally public until Tony had made you a suit.

Bruce

You're terrified of being kidnapped, so you refuse to go outside at night alone. If you have to go to dinner, you'll drag Bruce along just to protect you.

Bruce was horrified of hurting you, especially as the Hulk. He had a set of rules for you if he became the Hulk:

Rule one:
Don't go near the hulk. Try and take him from a distance.

Rule two:
If that doesn't work, run, hide, just get away.

Of course, you're not afraid of the hulk, so it was rare that you follow those rules.

Thor

You're afraid of his brother. You'll hide behind Thor when you come to face him.

Thor is terrified of none. He simply just shows/has no fear.

Clint

You are horrified of needles. Getting shots are terrifying for you, and Clint always has to come along to comfort you.

Clint is scared of death. He doesn't understand it, and it therefore scares him. After watching Pietro die in front of him, he's been absolutely terrified of it.

Natasha

You aren't afraid of anything. Sure, you scream on roller coasters and you get startled by people jumping out of corners, but you're not particularly afraid of anything.

Natasha is terrified of returning to the Red Room, its always been a huge fear of hers ever since she left.

Bucky (I've had to republish this because I totally forgot poor Bucky! You guys have to tell me these things!)

You are afraid of the dark, well, you can't be in the dark without having a blanket wrapped around you. You're terrified of what's hiding in the shadows.

Bucky is afraid of himself, as sad as it is.

Pietro

You are terrified of spiders. You'll be cleaning one minute and hiding the next. He, thankfully, always swoops in and either kills it or puts it outside, depending on the size of the spider.

Pietro is afraid of quinjets. He's fine on normal planes and jets, but if he's near a quinjet, he freezes up. After what happened in Sokovia, mixed with one time where his sister was in one and it malfunctioned, crashing, he's not very keen on them.

Wanda

You were afraid of letting go of someone you love. Whether it be your siblings, your girlfriend, or even your cat, you constantly worry about suddenly losing them or letting go of them.

Wanda is terrified of storms. With rain, she'll flinch every once in a while, but with storms... she'll scream, she'll cry, she'll hide and she'll desperately need someone to hold her and tell her everything is okay to feel better. It's post-traumatic stress after what happened when she and Pietro were little.

T'Challa

You are afraid of butterflies. Yes, those goddamned winged creatures that children think are cute and adults don't pay attention to. One will fly near you and you'll scream and hiss and run from it.

T'Challa is afraid of going bald, weirdly enough. He loves his cute little hair and as do you, he's shaken at the thought of losing it.

Peter

You're afraid of getting pregnant and giving birth. You want to have children, but the means it takes terrify you. It sounds like hell, he'll you don't want to endure.

Peter is afraid of his enemies finding you. He makes you go out with someone, never letting you be alone after one incident.

Sam

You are actually afraid of birds. After a run-in with a chicken when you were four, they've always freaked you out.

Sam is afraid of getting sick. He hates getting sick, and he constantly uses hand sanitizer to keep himself immune.

Rhodey

You are afraid of public speaking. You hate when a lot of people look at you, and you don't want them to judge you

James is afraid of AIs. After Ultron, he requested that FRIDAY not be a part of his suit, though she still runs operations without him knowing.

Scott

You are afraid of cotton. The material spun into a shirt is fine, but the actual plant makes you shudder to think about.

Scott is afraid of large bodies of water. Seas, lakes, oceans, they all terrify him. He is even freaked out when a pool is too big.

Zemo

You are afraid of blood. Whenever you see it, you just faint. You can't handle it.

Helmut is afraid of loud noises. He has to cover his ears a lot during soccer/football games and concerts.

Loki

You are terrified of fire. After you burned your hand on a bonfire when you were seven, you were terrified.

Loki is afraid of silver. The color, the material, it all just seems unnatural to him.