One challenge is communication. Dragons might not communicate in the same way as humans. So the human - turned - dragon has to figure out how to interact with both humans and other dragons. Another is dealing with the new instincts. Dragons have different survival instincts, like hoarding treasure or being territorial, which can conflict with the human's former way of life. They may also face threats from dragon hunters or those who see them as a threat to the existing order.
Well, a big challenge could be identity crisis. The human - turned - dragon is no longer fully human but also not born as a dragon. They have to figure out where they belong in the world. Physically, they may struggle with the size and strength of their new form, accidentally causing damage or getting into tight spots. Emotionally, they might miss their human life and relationships, but at the same time, be drawn to the freedom and power that being a dragon offers.
One major challenge is the physical pain. As the body changes from a human form to a dragon one, bones have to break and reshape, muscles have to grow and expand rapidly. This can be excruciatingly painful. For example, the elongation of the spine to support a long dragon tail would be like a searing pain throughout the back.
One challenge is communication. If they are turned into a Pokémon that doesn't have a human - like language ability, it would be hard to convey their thoughts and needs. Another challenge is adapting to a new physical form. For example, if they become a flying - type Pokémon, they have to learn how to fly which is completely new to them as humans. Also, they may face danger from other Pokémon who see them as either prey or competition.
One challenge would be dealing with Spike's reputation. If other characters know Spike well, they might expect the reborn human in Spike's body to act in a certain way. The reborn human would have to constantly prove that they are different. Another challenge could be the physical cravings of a vampire. Since they have a human soul, they might struggle more with the urge to drink blood.
One challenge could be communication. Since lions communicate in different ways like roaring, growling and body language, it would be hard for a human to fully understand and be understood at first. For example, a simple warning growl might be misinterpreted by the human.
Momonga would also face challenges in terms of adapting to the human lifestyle. He has to deal with things like finding shelter, getting food, and maintaining his health. In the game world, these aspects were not really relevant in the same way. He might not even know how to cook or find a proper place to live. And he would have to learn about money and how the human economy works, which is a whole new and complex system for him.
Social challenges would be huge. Society has different expectations for women and men. He would have to learn new social cues, like how women interact in groups or how to respond to male attention in a way that is appropriate for a woman. Also, he might face discrimination or over - sexualization because of his new gender.
Survival would be the main challenge. Lack of breathable air is a big issue. The human would need to figure out if the planet's atmosphere is suitable or find a way to create or purify air. For example, if there are certain plants on the planet, they might be able to use them to produce oxygen somehow.
One big challenge for Benhypno in human form would be dealing with his memories and instincts from his alien self. He might have flashbacks or urges to act in an alien way when he's in a tense situation. For example, if he's in a fight, his first instinct might be to use his full alien powers, which he can't do without revealing himself. Also, he may face the challenge of making friends. Since he has a different background, he may find it hard to relate to normal human teenagers and their interests.
They could face hostile monsters, difficult puzzles, and the struggle to find a way back to the surface.
Mentally, Ochaco would struggle. She has the mind of an older person but is trapped in a child's body. She would have to deal with the frustration of not being able to communicate as effectively as she used to. And she might feel a sense of loss for her normal life and the progress she had made in her hero training and relationships.