All of these characters have been created by me and FanOfTV.

Name: Natasha Rostova

Aliases: Natasha Reed

Nickname: Nat

Eye Color: Blue/Hazel

Hair Color: Blonde

Born: October 2nd, 1945

Age: (as of 1985 June 28 to October 4th) 40 (birthday is in between the one month time jump from the Battle of Starcourt to the day that Eleven, the Byers, Nadia and Niko leave Hawkins)

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Name: Nadia Rostova

Aliases: Nadia Reed

Other Name: 10

Eye Color: Brown

Hair Color: Blonde

Born: April 12th, 1966

Age: (as of 1985 June 28 to October 4th) 19

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Name: Nikolai Rostov

Aliases: Niko Reed

Nickname: Nik

Other Name: 12

Eye Color: Brown

Hair Color: Brown

Born: May 18th, 1971

Age: (as of 1985 June 28 to October 4th) 14

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Name: Hailey Harrington

Nickname: Hail

Eye Color: Brown

Hair Color: Brunette

Born: October 6th, 1971

Age: (as of 1985 June 28 to October 4th) 13

(birthday is just after The Rostovs, the Byers, Hopper and Eleven are no longer in Hawkins)

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Name: Ruby Charlize

Nickname: Jinx

Eye Color: Light Brown

Hair Color: Red

Born: June 11th, 1967

Age: (as of 1985 June 28 to October 4th) 18

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Cast:

Scarlett Johansson - Natasha Rostova / Reed

Olivia Holt - Nadia Rostova / Reed / 010

Dylan Kingwell - Nikolai "Niko" Rostov / Reed / 012

Alissa Skovbye - Hailey Harrington

Madelaine Petsch - Ruby Charlize

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General idea of what each power looks like:

Natasha's shield power:

Nadia's power is psychic energy manipulation, given a lot of variety of what she could do, but she mostly uses it in a whip or sword form because it's easier on herself (physical toll of using too much of her power), and because it can be extremely helpful in fights against Demogorgons.

Nadia's psychic energy whip and sword:

Niko's pyro power:

Ruby's Psychic Beam Power: 

+ when Ruby is losing control and completely glowing, the super sized beam starting in 3.01-3.05.

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Natasha's Car:

Nadia's Car:

Niko's Bike:

Ruby's Motorcycle:

Ruby's Helmet:

Rostov/Reed House: