There are often side characters that play important roles too. There could be a wise old mentor figure who gives advice to the main characters. Maybe an old wizard or an experienced warrior. And then there are the friends of the main characters, who might be other adventurers or people from their village or town. They add more depth to the story and sometimes help the main characters through difficult situations.
Sure. There's often the 'hidden power' trope. The female or male lead might have some kind of latent magical ability that they discover during the course of the story, and this power is often related to their journey of love. For example, the power might only be fully awakened when they are in the presence of their true love. And the 'mentor' trope can also be present, where an older or wiser character guides the main characters in their relationship and in dealing with the challenges of the fantasy world.
Another typical trope is the 'obstacles to love'. This could be in the form of a rival who also has feelings for one of the main characters, or a social hierarchy that makes their relationship difficult. For instance, if one is a noble and the other a commoner, there will be many challenges to overcome for their love to thrive.
Commonly, in a typical romance manga, you'll find sweet confessions, misunderstandings that need to be resolved, and maybe a grand gesture to show true love at the end.
There are often heroes. They are brave and usually have some special abilities or skills that help them in their adventures. Wizards or mages are also common. They can control magic and are often the ones with great knowledge. And there are usually monsters. These can range from simple goblins to powerful dragons.
The update of a typical romance manga might vary. Sometimes it's regular, but there could be delays due to various reasons like the author's schedule or editorial decisions.
The unique plot twists might make it stand out. In a typical fantasy romance, if there are unexpected turns in the relationship or in the overarching story arc, like a sudden revelation about a character's true identity that changes the dynamics of the romance. Another factor could be the writing style. If it has a really engaging and lyrical way of storytelling, it can draw readers in more than other novels in the genre.