Main party:
Psychotic is the nicest character in the main party and he enjoys luring people into exquisite traps where they fall into lava. He will also raid their homes of all their belongings.
DK's role is to take villagers and explode them. He also eats every single town out of house and home. The man loves his pork belly.
theundeadhero is a gorgeous princess with a mysterious pendant and the last survivor of an ancient race. He also is extremely racist against Moogles, for reasons that will develop over the course of the story.
3 changeables
Faris would be a down-and-out pirate who has fallen by the wayside. Her once fine and purple hair has turned orange. She learns to love again and is very handy with a bell.
Laddy would be a very strong and well built man who could punch through walls and eat trucks. He has a pet goat that he keeps within his beard, named Archibald.
Quin is a Dancer. I don't need to expand further upon that.
NPCs
Imagine Raistlin in sodden grey underpants, gently stroking your cheek. When you raise your voice to object, he whispers that he's going to cook you some Tuna wafers. You're not quite sure what this means.
Loony BoB is an annoying NPC who says "You want to rescue the princess? Oh, but that means you've got to rescue EVERY princess! Why, you'd have to rescue EVERY WOMAN ON EARTH! You want to keep every woman to yourself? You want to enslave every single woman on the planet and force them to become your sex slave? No, you can't possibly do that". You get to punch him in the balls.
Goldenboko would be a newt.
Rival
Del Murder. Goes without saying. You eventually have a thunderdome rap battle with him. If you lose, it is game over and all your save files get wiped.
Big Bad
Iceglow. Iceglow used to be a totally evil awesome badass dude who committed numerous atrocities. Then everyone in the world came together to wipe his mind, turning him into a loveable bumbling idiot who hangs around the party. At the end of the game, he gets his memories back. And promptly is soundly defeated and becomes cuddly ol' Steve again.