Shigatsu wa Kimi no Uso: Admiration

Nagi Aiza smiles and introduces her annoyed brother Takeshi

Takeshi Aiza and his younger sister, Nagi, are both accomplished pianists who seek to be the equal of their personal heroes.
From the anime series Shigatsu wa Kimi no Uso (Your Lie in April)

HaruChika: Haruta & Chika: Over There

Minami Kamijou and Haruta Kamijou looking to the left while standing in front of a building

Minami Kamijou is oldest sibling in her family and works as an architect, while her brother, Haruta, is the youngest, the only male, and still a student in high school. They have two middle sisters, Tsumugi and Fuyuna, (never shown in the anime) who annoy Haruta to the point that he moves out of the house.
From the anime series HaruChika: Haruta & Chika

Magikano: All for One

Haruo Yoshikawa, Maika Yoshikawa, and Chiaki Yoshikawa standing together looking at Fuyuno Yoshikawa

Haruo Yoshikawa has incredibly powerful but destructive magical abilities, but he isn’t aware of them or of magic in general because Maika, Chiaki, and Fuyuno, his magic-using, younger sisters, act normal in order to protect him.
From the anime series Magikano

Selector Infected WIXOSS: So Close Yet So Far

Kazuki Kurebayashi and Yuzuki Kurebayashi standing back-to-back against a pillar of pink light

Yuzuki Kurebayashi fights as a Selector in order to make her wish come true. Her younger twin brother, Kazuki, helps her whenever possible, even though he doesn’t know her true desires.
From the anime series Selector Infected WIXOSS

Joukamachi no Dandelion: The Royal Bunch – Part V

Hikari, Teru, and Shiori Sakurada standing in front of a crowd

Instead of wanting to be a ruler, Hikari Sakurada, the fifth princess, dreams of becoming a singing idol. Similarly, her younger brother, the third prince, Teru, only sees himself as a hero, while Shiori, the sixth princess and youngest child, just likes being with her family.

From the anime series Joukamachi no Dandelion (Castle Town Dandelion)

Joukamachi no Dandelion: The Royal Bunch – Part IV

Misaki and Haruka Sakurada in school uniforms

Fourth princess Misaki Sakurada enjoys being with her younger twin brother, the reliable second prince, Haruka, and he is happy to support her in whichever ways he can.

From the anime series Joukamachi no Dandelion (Castle Town Dandelion)

Joukamachi no Dandelion: The Royal Bunch – Part III

Aoi, Shu, Kanade, and Akane Sakurada in a neighborhood

Aoi Sakurada, the blue-haired first princess, is the most favored to win the election to succeed the king. Her younger siblings, Shu the first prince and Kanade the second princess, are twins who are diametrically opposed when it comes to their interest in winning. (She cares; he doesn’t.) Meanwhile, Akane, the shy third princess who often hides behind her older siblings in public, prefers to live life out of the spotlight.

From the anime series Joukamachi no Dandelion (Castle Town Dandelion)