- Author Appeal: Unconfirmed, but while the series doesn't go as far as BrotherSister Incest (especially like a similar series), there seems to be an abundance of Little Sister Heroine-like characters since nearly every character either has or is one.
- Author's Saving Throw: The fans went nuclear when Umaru decided to stop being a Himouto for her new friends' sake. Thankfully the author noticed and wrote it so that she decided not to give that aspect of her personality up when her friends told her that no matter what happened, they'd still be her friends. If that's what he hadn't already planned all along...
- Base-Breaking Character:
- Umaru herself is this. Either she's adorable, relatable, hilarious, and the best portrayal of a female Otaku since Konata Izumi, or she's an annoying spoiled brat who always gets what she wants, while being too perfect with little effort.
- In some circles Ebina is loved for her Moe factor as well as playing an excellent Foil to Umaru. Others find her to be too normal compared to her wacky friends and detest her for her conspicuous lack of a backbone.
- Sylphynford Tachibana is either a cute Genki Girl whose misguided efforts to get Umaru's attention are always good for a laugh, or a one-note side character who is even more annoying than Umaru.
- Broken Base: Many fans who followed the manga for its unique take on a sibling relationship were not pleased when it began to focus more and more on Umaru's social life rather than Umaru and Taihei at home (in particular, there was a span of about thirty chapters where the Doma house was not shown at all). Detractors claim the Genre Shift into a Four-Girl Ensemble is to the series' detriment. Thankfully, the author seems to have noticed the criticism and has worked more Umaru and Taihei chapters in between the social ones.
- Ear Worm: The opening for the anime, especially the first few seconds! Aimi Tanaka, Umaru's voice actress, is seen here doing a VERY enthusiastic "full version" of the opening theme in front of adoring fans!
- Escapist Character: Umaru is this for many fans, being able to be perfect at everything outdoors, while regressing to gaming and lazing around indoors.
- Hilarious in Hindsight: One of this series' many Shout Outs is the "Gapcom" game center employee who looks like Ryu from Street Fighter. Then Street Fighter V Arcade Edition brought back fan favorite Sakura Kasugano, and her official story is that she now works part-time...at a Capcom game center. Like mentor, like student.
- Les Yay:
- Quite a bit between Kirie and Umaru, especially since Kirie has a pretty blatant crush on Umaru.
- There is also a bit between Umaru and Sylph. It gets turned up in later chapters due to Sylp miswording things like telling UMR-san "Thank you for going out with me" while in the middle of a date like scenario or spending an entire day trying to get UMR-san to play The Pocky Game with her while not even knowing what it is.
- Then to complicate things a bit both Kirie and Sylph have Les Yay with one of Umaru's alternate identities, Kirie with Komaru and Sylph with U.M.R.
- Memetic Mutation:
- The country owes me a big brother.Explanation
- Umaru on the front page! Explanation
- WHAT THE FUCK IS THAT THING Explanation
- "I'M LOVING HAMBURGERS!"Explanation
- Most Wonderful Sound: "Umaruuun"Explanation
YMMV / Himouto! Umaru-chan