Nukegirl:

She is the first playable character in the paid version and the only one playable in the free version.

Origins: She escaped a weird lab that was experimenting on mutants. She is 50% nuclear energy and 50% human killing machine.
Weapon: Machine Gun that marks the last enemy hit. (Marked enemies take 2x damage from your bullets)
Sugar Overkill: Trigger a nuclear explosion that deals 50 damage to all enemies around you.
Cost: 12 candies.
Personal Cocktail: After getting a kill, you shoot twice as fast for a short time.

Nukegirl is a very straightforward character. She's all about dealing the most tremendous amount of damage possible.
Her most important weakness is the overheat. The player needs to be able to choose when to shoot and not to shoot to avoid dying from overheat or not being able to shoot at the right moment. Her Sugar Overkill allows her to get out from impossible situations by dealing 50 damage to all enemies around. 

Fortune Teller upgrades:
For 3000$ the Fortune Teller can upgrade your Sugar Overkill. He will randomly choose for you:
- Your Sugar Overkill also damages portals
- Your Sugar Overkill grants you a legendary candy-up.
- Your Sugar Overkill deals double the damage.