Who are the main characters in Ethan's Vengeance of Love novel?
As the title suggests, Ethan is likely a central character. In a 'vengeance of love' story, there could be his love interest, let's call her, for example, Isabella. She might be the reason Ethan is seeking vengeance. Then there could be some side characters, like Ethan's friends or family members who either support or oppose his quest for revenge. There may also be the villains, who could be those who have caused harm to Ethan's love, whether it's through lies, force or other means.
Since I haven't read 'Ethan's Vengeance of Love novel', it's hard to say exactly who the main characters are. However, Ethan is clearly a key figure. There may be a love interest who is in some sort of trouble or has been wronged, which spurs Ethan's vengeance. There could also be a mentor - like figure who tries to guide Ethan on his path of revenge, or a foe who is extremely powerful and stands in the way of Ethan achieving his vengeance for love.
I don't know for sure, but I assume Ethan is one of the main characters since the novel is named after him. There might also be the object of his love, perhaps a female character. And there could be antagonists, like the people who have wronged Ethan in the context of his love, such as a rival or someone with malicious intentions towards his relationship.