Middle Schooler, Weak, Skinny. Percy changes over these few chapters because he went from being a normal kid to being the son of Poseidon.He had to face beating off multiple creatures in order to be safe.
Easy target, Bullied, Innocent. Grover changed a lot in these chapters because he went from being 11/12 to 28b8 and a half horse half human. Grover had to face lying to Percy for a while about how he had to protect him
Gentle, Nice, unfortunate. Percy's mom changed a lot because she was happy with her son where they had always gone and now because of this his mother was now gone she basically vanished. She had to face not telling Percy who his dad was for a lot of years to protect him from what is happening.
Creature, Monster, Math teacher. Mrs. Dodds changed from being a sweet teacher to being a furious demon thing in the first couple of chapters. She had to fight Percy and was challenged because she ended up losing.
Middle-aged guy, teacher, cripple. Mr. Brunner changes a bit in these past few chapters because he went from being a human to part goat and didn't need a wheelchair after all. Mr B. had to face lying to Percy about him being actually a special kid.
Bully, Rude, Cruel. Nancy didn't really change much in these chapters but she was the bully of Grover. She had to face being a bully but she did not care much about that.