As mentioned before, in the Epic of Gilgamesh, the main characters related to a form of love are Gilgamesh and Enkidu. Gilgamesh is a powerful king, and Enkidu is his friend, and their relationship is complex and deep.
For the story of Eros and Psyche, Eros, the mischievous god of love, and Psyche, the beautiful mortal, are the main characters. Eros shoots Psyche with his arrow, which makes him fall in love with her, and Psyche has to endure many challenges set by Aphrodite to be with Eros.
In the case of Inanna and Dumuzi from Sumerian mythology, Inanna was a powerful goddess and Dumuzi was a shepherd - god. Their relationship was complex, with Inanna being the more dominant figure in some aspects, and Dumuzi being the object of her love and desire.
I'm not sure as you haven't provided the specific 'the first love story'. It could be two young people, perhaps a boy and a girl, like in many classic first love stories.
In the case of Adam and Eve, they are the main characters. Adam was the first man, and Eve was created from his rib. They were meant to be together in the Garden of Eden, and their relationship was fundamental to the creation story in the Bible.
I'm sorry, I have no information regarding 'feiler first love story' and thus can't identify the main characters. Maybe there is a Feiler as one of the main characters, and then there could be the person Feiler falls in love with. And perhaps there are side characters like a best friend who gives advice during the course of their love story, but this is all just guessing without any real knowledge of the story.
Maybe it's about two people from different cultures. For instance, an American exchange student who falls in love with a local in a foreign country. Their different backgrounds would bring a lot of interesting elements to the story, such as misunderstandings at first but then a deep understanding as their love grows.
There might also be some side characters like friends or family members. Friends could play roles such as confidants, giving advice or causing some misunderstandings in the relationship of the main characters. Family members could have an impact on the relationship too, for example, by having certain expectations or being supportive or against the first love.
Since I don't have the exact details of 'parallel world love story', generally speaking, there would be characters whose lives are intertwined across parallel worlds. Maybe there's a protagonist who discovers the existence of a parallel world and meets someone there who becomes a central part of the story. There could also be side characters that help or hinder the relationship between the main characters from different parallel worlds.
I don't know the specific main characters in 'First Bite Vampire Love Story' as I haven't read it. But usually, there would be a vampire character, probably male or female, who is the love interest. And there would be a human character as well, who gets involved in this vampire - centered world.
There could also be side characters that play important roles. For example, a best friend of the female lead who is skeptical about this love at first sight. He or she might try to protect the female lead from getting hurt, adding more conflict to the story.
The millionaire is one of the main characters. He is likely to be a complex character with his own set of values shaped by his wealth. The other main character would be his love interest. She might be someone with a very different personality, perhaps more down - to - earth or with strong moral values. There could also be side characters like the millionaire's friends or family members who play important roles in either supporting or opposing their relationship.