History Main / MonsterBrotherCutieSister

** First with Hikigaya siblings, Hachiman and Komachi. The former isn't exactly ugly or feared by everyone else, but Komachi certainly is a cutie that has nothing to do with his brother, but Hachiman has a BigBrotherInstinct over her, also inherited to [[ReiAyanamiExpy Rumi Tsurumi]] and [[SenpaiKohai Iroha Isshiki]].

* ''Manga/DemonSlayerKimetsuNoYaiba'': [[spoiler:Gyutaro]] was hated by everyone, even his own mother, because of his countless birthmarks. His sister, [[spoiler:Ume]], however, was said to be beautiful from an early age.

* ''Literature/TheIrregularAtMagicHighSchool'' subverts this trope. Tatsuya is a cold, intimidating soldier, whose lack of interest in conversation (combined with his incredible intellect) often make people feel like he thinks himself above them. Miyuki, his much prettier younger sister, impresses everyone with her politeness and approachability...because she's under incredible pressure from her family to act that way, as the next heir. Both siblings are heroic, but in battle Miyuki shows her volcanic temper and willingness to MindRape;, Tatsuya kills his enemies quickly and considers most conflicts NothingPersonal. This is reflected in their eye color, Miyuki's eyes being a pale, icy blue, and Tatsuya's a deeper, warmer color.

* ''WesternAnimation/ToyStory1's'' Sid and Hannah Phillips. The latter is a young GirlyGirl that likes to have tea parties with her dollies, while the former is an unstable child that likes to bully his little sister and is a toy's worst nightmare.

* In the ''VideoGame/GuiltyGear" series, Delilah is a kind and peaceful, albeit gloomy and socially and awkward young child. This contrasts a bit with her late brother Bedman, a dream-manipulating HitmanWithAHeart who tends to act like a snarky InsufferableGenius.

* ''Literature/ThatTimeIGotReincarnatedAsASlime'' has Souka and Gabiru. While they were initially introduced as lizard monsters, Souka transforms into a cute girl with wings after being named by Rimuru, while her brother remains lizard-like. There are several implications through the story that this is because Gabiru and his crew focused on becoming more powerful and bulky, while Souka and her group deeply desired to aid the {{Ninja}} Souei, to which smaller and lighter human-like bodies would help immensely with both stealth and disguised subterfuge.

* ''Literature/ThatTimeIGotReincarnatedAsASlime'' has Souka and Gabiru. While they were initially introduced as lizard monsters, Souka transforms into a cute girl with wings after being named by Rimuru, while her brother remains lizard-like. Maybe justified in that Gabiru was already named by a much weaker being before encountering Rimuru, so he can't be re-named to receive a more humanoid appearance.

* Downplayed twice in ''LightNovel/MyYouthRomanticComedyIsWrongAsIExpected'':

* ''LightNovel/ThatTimeIGotReincarnatedAsASlime'' has Souka and Gabiru. While they were initially introduced as lizard monsters, Souka transforms into a cute girl with wings after being named by Rimuru, while her brother remains lizard-like. Maybe justified in that Gabiru was already named by a much weaker being before encountering Rimuru, so he can't be re-named to receive a more humanoid appearance.

* ''LightNovel/TheIrregularAtMagicHighSchool'' subverts this trope. Tatsuya is a cold, intimidating soldier, whose lack of interest in conversation (combined with his incredible intellect) often make people feel like he thinks himself above them. Miyuki, his much prettier younger sister, impresses everyone with her politeness and approachability...because she's under incredible pressure from her family to act that way, as the next heir. Both siblings are heroic, but in battle Miyuki shows her volcanic temper and willingness to MindRape;, Tatsuya kills his enemies quickly and considers most conflicts NothingPersonal. This is reflected in their eye color, Miyuki's eyes being a pale, icy blue, and Tatsuya's a deeper, warmer color.