It is a totally free game. You can buy all of the characters using virtual gold you earned in the game. You can also use a credit card to accelerate this process.
Some of the characters are inspired by people in real life, like my girlfriend. She loves reading books, so the character can use a pile of books to block enemies. Some are inspired by some famous characters. For example, a man with a big dog is inspired by Jon Snow; a man lost his hand is inspired by T-Bag, a beautiful girl with a wand is inspired by Sailor Moon. All of these characters' graphics and animations are well-designed and look fantastic. They are completely original both graphic-wise and code-wise. Each character has his/her unique skill and survivability. If you have any idea of a character that fits this game, please leave your comments and suggestions at http://www.poisonedjungle.com . Thanks!