It's hard to determine if it's popular without more information. Just based on the title alone, it doesn't seem to be one of those highly publicized light novels. But there could be a passionate fan base for it that we're just not aware of, especially if it has been self - published or has a very specific target audience that it caters to really well.
I don't know if it's popular. It could be that it's just starting out and not yet widely known, or it could be a niche light novel that only appeals to a small number of readers who are interested in its particular take on the idea of being a 'waste' in the context of the story.
No, it isn't. 'I was waste' is an improper construction. If the intention was to say something like 'I was a waste' it would still be an unusual and not very standard way of expressing oneself. And then 'light novel' is just tacked on without proper grammar to connect it. So overall, it's not a proper sentence.
Since I don't know the exact 'I was a waste' light novel, it could potentially deal with themes of redemption. The main character could start off in a low point in their life, thinking they are worthless or a waste. Then through various events like making new friends, finding a passion, or facing challenges, they gradually transform and find value in themselves.
It's not a very common or clear phrase. 'I was waste' might be an incorrect or very idiosyncratic use. Maybe it was supposed to be 'I was wasted' which could imply being extremely tired or under the influence in a more informal sense. And 'light novel' is a type of Japanese novel, often with anime - like illustrations. So perhaps the person is trying to say something about a past state in relation to a light novel in a rather unclear way.
One possible theme could be self - discovery. The idea of feeling like a 'waste' might lead the character to explore who they really are and what they can become.
Well, without more context, it's hard to say much. It could be a self - deprecating title where the protagonist has a low opinion of themselves. Maybe they start off as a 'waste' but then go through a journey of self - discovery and improvement in the light novel. For example, they could be a student who is failing at school and is seen as a waste by others, but then finds a hidden talent or purpose.
One similar light novel could be 'Re:Zero − Starting Life in Another World'. It also has a main character who initially seems out of place and has to struggle in a new and often unforgiving world.
There were a few novels about the good-for-nothing prince that he recommended. Among them were " Young Master Han of the Qin Dynasty "," The Phoenix Returns to the Ninth Heaven: The Grand Preceptor is too enchanting "," The Poison Concubine Shocks Beauty: The Underworld Emperor's Gentle Favor "," The Awakening of the Trash Prince "," The Survival Guide of the Abandoned Prince "," I am the Crown Prince "," The Highest Grade Abandoned Prince "," The Trash Prince: Why Do You Force Me to Become the Emperor?" " The Traversing of the Abandoned Crown Prince " and " Transmigrated to become the Abandoned Crown Prince ". These novels covered different topics and storylines, satisfying the readers 'interest in the trash prince's transmigration.