I'm not sure as the title doesn't give any hints about the characters. But they could be two lovers, one perhaps more cautious or thorny in nature and the other more gentle and like a blossom.
The title doesn't disclose the main characters. However, they could be a pair of individuals with opposing traits. For example, one might be a person who has been through a lot of hardships and has become a bit prickly, like the thorn. And the other could be someone who is full of life and love, like the blossom. And the story could be about how their love unfolds with their different natures.
Well, it could be about a love that has two aspects, like the thorn which might represent the difficult or prickly parts of the relationship and the blossom representing the beautiful, positive aspects.
As I don't know the exact '4 sided fantasy story', I can't say for sure. But it could be four adventurers, like a warrior, a mage, a thief, and a healer.
The main character is obviously the lion. It is the central figure around which the story revolves as it is the one with the thorn and in distress.
Often, other clone troopers are paired with him. They share a brotherly bond in the fanfiction, and they fight side by side. For instance, Rex might be a common character paired with Thorn, as they both are important figures in the clone army.
I don't know for sure, but it could be a hero with the thorn wings of fire as the main character. There might also be a villain who opposes this character.
In the powerpuff girls blossom story, Blossom is the central figure. However, other significant characters include her two sisters. Bubbles, who is sweet and has the power of sonic scream among others, and Buttercup, the tough and feisty one. Additionally, Professor Utonium, their creator, also plays a role in the story. And then there are the villains. Mojo Jojo is a recurring bad guy, always trying to outwit the Powerpuff Girls. There are also other villains like Fuzzy Lumpkins who add to the challenges that Blossom and her sisters have to face.
I have no idea as I haven't read it. But there should be the character who is 'in love with two of me', and probably some supporting characters like friends or family members who are involved in this complex situation.
In the 'To Write Love on Her Arms' story, the central character is someone in a troubled state, often a girl dealing with issues that make her feel lost. Then there are the people around her. Her friends are important as they might be the ones to initiate the idea of writing love on her arms as a form of positive message. And her family, who may or may not be fully aware of her struggles at first, but later become part of the support system. There could also be some sort of counselor or mentor figure that helps her along the way.
There might be a male lead, like Jack, who is a brave adventurer in the world of 'a jaded blossom fanfiction'. He could be on a mission to protect the 'jaded blossom' from those who want to use it for evil purposes. He may have unique skills and a strong sense of justice.
Meggie is an important character. She is the central figure whose life and loves are the focus of much of the story. Father Ralph is also crucial. His relationship with Meggie is complex and drives a lot of the plot.