Tsugumomo: Overactive Imagination

A blushing Kasumi Kagami, garbed in a white shirt andd pink apron, holds herself and acts surprised. Kazuya Kagami looks at her, unamused, in a red T-shirt and blue shorts.

With their father always working and their mother having passed away, Kasumi Kagami assumed the responsibility of taking care of her younger brother, Kazuya. She can be a bit obsessive when it comes to his safety and well-being, though. (And from his perspective, the less said about her desire to tend to his physical needs, the better.)
From the anime series Tsugumomo

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Rockman Hoshi ni Negai wo: Battle Kids

A close-up of Rockman (Mega Man) and Roll

Rockman (Mega Man) and Roll are sibling robots who were created by Dr. Light to be his assistants, but now they work to defeat the rogue robotic creations of Dr. Wily.
From the anime series Rockman Hoshi ni Negai wo (Mega Man: Wish Upon a Star)

Digimon Adventure: Ready for Action

Taichi Yagami is standing with his fists raised. Hikari Yagami stands next to him. Both are looking in the same direction.

Taichi Yagami and his younger sister, Hikari, along with their digital monster companions, are among those destined to save the Digital World from the forces of evil. (These two DigiDestined are also known by the names Tai Kamiya and Kari Kamiya in other heroic tales.)
From the anime series Digimon Adventure

Mobile Suit Gundam: Iron-Blooded Orphans: Squeeze

Biscuit Griffon being hugged by Cookie Griffon and Cracker Griffon at the same time

Biscuit Griffon works for a private security company (and then a mercenary group) in order to make enough money to support his family and send Cookie and Cracker, his younger twin sisters, to school.
From the anime series Mobile Suit Gundam: Iron-Blooded Orphans

The Savages: Awkwardness

Jon Savage and Wendy Savage both standing in an open doorway. She's holding a coffee and a balloon.

Jon Savage and his younger sister, Wendy, are adult siblings who grew apart over the years but have come together again to take care of their estranged, ailing father.
From the movie The Savages (2007)

Shi Mao and Shi Fen in Ani ni Tsukeru Kusuri wa Nai!: Good Times

Shi Mao and Shi Fen standing with their arms crossed in front of a large clock

Shi Fen’s lazy and selfish actions constantly annoy his athletic younger sister, Shi Mao and cause her to beat him up. However, at the end of the day, they still get along and look out for each other.
From the anime series Ani ni Tsukeru Kusuri wa Nai! (There’s No Cure for My Brother!)

A Nightmare on Elm Street 4: The Dream Master: Swish!

Rick Johnson does a celebratory fist pump with both hands while Alice Johnson smiles

Rick Johnson, a Karate enthusiast, and his daydreaming younger sister, Alice, work together to fight against a supernatural being who kills people in their dreams.
From the movie A Nightmare on Elm Street 4: The Dream Master