I'm not entirely sure specifically as there could be different stories within it. Generally, graphic novels combine pictures and text to tell a story. It might be about an adventure, a character's journey, or some sort of relationship drama.
There was a boy who bought a squish pop from an old, creepy vendor. When he unwrapped it, instead of the normal fruity smell, there was a putrid odor. As he squeezed it a bit, it made a sound like a dying animal. Then, suddenly, the squish pop formed a face with sharp teeth. It snapped at his fingers. He tried to throw it away, but it stuck to his hand. It started to slowly climb up his arm, squeezing tighter and tighter, as if it wanted to suffocate him.
I don't know the exact main characters without more information. But it could be Squish himself as the title seems to suggest, and perhaps some friends or family members who play important roles in his story.
Power is a major theme. The idea of rising to become an overlord involves gaining power. Another theme could be survival in a strange and often dangerous world. Since it's 'Squish Overlord', there might also be some unique physical or environmental aspects that play into the story.
I think the scariest part is when the squish pop shows some form of intelligence. For example, if it starts to communicate like in the story where it whispered 'I'm not a treat, I'm a trap.' It's terrifying because it makes you realize that it's not just a random, inanimate object but something with a malicious purpose.
Well, I'm not entirely sure which 'Squish Overlord' light novels are the best as it depends on personal taste. But generally, you can start with the ones that have high ratings on book review platforms. They often have a good blend of action, adventure, and character development, which are common elements in this type of light novel.
You might be able to find it on some specific children's entertainment platforms or websites that offer Urdu-dubbed content. Try checking popular streaming services.