One common theme is honor. Orcs are often depicted as having a strict code of honor within their clans. Another theme is struggle, like their fight for survival in a harsh world. Also, loyalty to their tribe or comrades is frequently explored.
It could be through some kind of magical transformation or a hidden heritage revealed. Maybe there was a prophecy or a special event that triggered it.
Often, in such manhwas, the princess becomes the queen due to various factors. It could be because of her noble birthright, her ability to handle political intrigues, or her kindness and wisdom that win the hearts of the people and the support of important allies.
Sure. Some stories tell of an elf princess making friends with different creatures in the forest. She learns about their cultures and helps them in times of need, which is a great positive and family - friendly story.
One common theme could be the clash of different cultures. The elf culture from the princess's side and the ninja culture in Naruto. Another theme might be friendship. Maybe the elf princess forms strong bonds with Naruto and his friends.