Caseus the Cheese, our main character in this story, is a good-willed character who inherited a fortune from his mother, Casea. He enjoys visiting bars and hanging out in his villa.
Oliver the lovable possum is a good friend of Caseus' and an enthusiastic adventurer. He lives in an insula and was a childhood friend with Garum, before he turned sour.
Once an innocent, kind bowl of fish sauce, Garum had his evilness thrust upon him in the form of a desire for revenge, when Caseus' father was framed for killing Garum's father. Garum, of course, believed such accusations, and swore to avenge his father's death when he heard that Caseus had come back from the dead. However soon the two became friends when they discovered the true murderer, Caro.
Caro is the mysterious true villain of the story, the killer of Garum's father and the person who framed Caseus' father for murder. Once Garum and Caseus discovered this, they teamed up to fight Caro and get him arrested. Ever since, Caro rots in prison.