One of the main features could be the character development of the sister. Starting as a gal - like character, she may grow and change throughout the story. There could be plotlines about her making friends, dealing with school bullies or social situations due to her appearance and style. And of course, the relationship with her brother or other family members would be a central part of the story, with their interactions evolving over time.
Another option is 'Oreimo'. It has a somewhat similar theme of exploring the relationship between siblings in a rather unique way. It delves into the life of the brother and sister duo, showing their daily interactions, misunderstandings, and the growth of their relationship over time.
This title could imply a number of things. The 'zangyaku sugiru isekai' part might suggest an isekai world that is overly cruel or extreme in some way. The 'demo suzuki wa kawaii' part then contrasts this by stating that Suzuki is cute. In the context of a novel, it could be that the story revolves around Suzuki's experiences in this extreme isekai world. The author might be using Suzuki's cuteness as a way to draw readers in and make them interested in seeing how such a character copes in a not - so - friendly otherworld. It could also be a statement on the nature of beauty and kindness (represented by Suzuki's cuteness) in the face of harshness (the extreme isekai).
I'm not sure if it's a popular genre just based on this title. It seems like a very specific type of isekai novel with a focus on a cute Suzuki character in a rather extreme isekai world. There may be a niche audience for it, but it's not clear if it represents a widespread popular genre.
Sorry, I'm not very familiar with this 'maou no kawaii yamada wa yoiko light novel'. You can try to search for it in some light novel specialized websites or forums.
There are many examples of realistic Gal:
1 " RE: Life in an alternate world from scratch ": The main style of this work is a game, and the style is more realistic.
2." Evil Crown ": The battle scenes and character design of this work are very detailed and realistic.
3." Original God ": The game's style is relatively detailed and rich in details. At the same time, it also pays great attention to the character's description and the setting of the background story. It can be said to be a more realistic Gal.
These are just examples. There are many other realistic Gals that are worth recommending.
Well, that's hard to say. Kawaii is a subjective perception. It could be based on your expressions, style, or the way the artist portrays you in the comic.