Since it's a novel, it's likely to have a complex set of characters. There might be a group of people who are on a journey with the main character. Some might be allies, trying to support the character in changing their stone cold heart. Others could be rivals within the group, creating internal conflict while the main character is also dealing with their own emotional state.
Without having read the 'heart stone novel', I can only guess. There may be a character who stumbles upon the heart stone by accident and then becomes the central figure in the story. There could be an old wise character who knows about the heart stone's history and tries to guide the younger characters. And perhaps there are some antagonists who will stop at nothing to get their hands on the heart stone for power or wealth.
I don't know for sure. It could be a hero with a mysterious past.
Since it's a graphic novel, there might be a group of adventurers as the main characters. One could be a strong and silent warrior type, who is physically capable of protecting the stone heart. Another could be a clever thief who has the skills to steal or retrieve the stone heart from dangerous places. And there could be a wise scholar among them, who can decipher the ancient texts and clues related to the stone heart's origin and power.
Well, it could be centered around redemption. Maybe the character with the stone cold heart has made some mistakes in the past and the story is about their journey to make amends and soften their heart in the process.
Most likely the main characters are the Beauty and the Beast. Just like in the traditional story.
In 'The Camel Club' series, Oliver Stone is a main character. He's a former intelligence agent with a lot of secrets. In 'Memory Man', Amos Decker is the central figure. He has a condition that gives him a photographic memory but also causes him some problems. And in 'The Fix', the main character is a journalist named Rick Dockery who gets caught up in a big mystery.
It's hard to say without more details, but there could be a fearless warrior as one of the main characters. This warrior might be on a mission related to the heart of stone.
It could be for mystery and thriller lovers. People who enjoy stories with complex characters like Caz Frear, who may have a stone cold heart for some reason. Usually, such novels attract readers who like to dig deep into a character's psyche.
I'm not sure specifically as I haven't read it. But it might be about a character named Caz Frear and their experiences that lead to a 'stone cold heart'. Maybe it's a story of how someone becomes hardened by life events.
The main characters include a young hero who is on the quest for the Heart of Stone. There is also an old wizard who provides guidance to the hero. And a villain who wants to use the Heart of Stone for his own evil plans.