The main character could be Pou. However, there could also be other important characters in the story that contribute to the sad nature of the story. For example, if Pou has a friend or a family member, their actions or fates could be intertwined with Pou's and play a role in the overall sad story.
The main character in the springtrap sad story is Springtrap himself. He is the one who endures the tragic transformation and all the miseries that follow.
As we don't have the details of the story, it's impossible to say who the main character is exactly. It could be an ordinary woman with an ordinary name, like Mary or Jane.
It could be a lonely old man. He has outlived most of his friends and family, and he spends his days reminiscing about the past, which is filled with memories that now only bring him sorrow.
It's highly probable that the main character of the 'owl boy sad story' is the owl boy himself. From the name, we can infer that the story focuses on him. He could be a special being, half - owl half - boy perhaps. And all the misfortunes, sorrows, and challenges in the story are most likely centered around him. Whether it's about his personal growth, his relationships, or his fight against certain adversities, he is the one at the heart of this sad story.
It could be an old villager who has seen the village change for the worse over the years. Maybe he used to remember a time when the village was prosperous and happy, but now it's full of sadness, and he's the one who tells the story.
A Sim who has always been an outcast in their community could be the main character. They are constantly bullied or ignored by others. This makes them feel unloved and sad. Their story could be about how they try to find acceptance and love in a world that seems so cold to them, but keep failing, which only adds to their sadness.