Survivors:

Unwitting Volunteer: Welp, you didn't really ask to work on this project with your buddies. Has no special abilities.

Necromantic Scientist: You have the knowledge and skills needed to bring back someone to life, albeit only partially. Twice per game you can speak to the dead by asking the GM a question of 20 words or less. The dead player will then respond in 20 words or less, and you will be told their reply.

Detective: Gets clues on the role of anyone they choose to investigate. Each investigative PM upon someone contains 5 roles, one of which is the investigated player's correct role.

Combat Medic: Every night, you can choose to protect someone from getting killed.

Hunter: Has a 3-time use ability to learn anyone's alignment.

Hacker: Your skills in hacking machinery will come to good use.  Once per night, protect an objective from getting attacked by the Cracker.

Soldier: Time to put your combat skills to good use. Every night, you may choose to kill someone. If they're a Traitor, they die, If they're a Survivor, you die.

Traitors:

Mad Doctor: A doctor you are? Ostensibly. Can block someone's role once per night.

Cracker: Hacker's a neutral term, Cracker's where it's negative. Can either:

• Sabotage something on the map, which has a high chance of adding another objective that must be completed by the next dayphase, and has a low chance of preventing an objective from ever being completed for a full dayphase.
  
• Muffle any clues the Detective gets.
  

The total amount of times they can do any of the two actions is three. (i.e. 3 muffle; 2 sabotage, 1 muffle)

Mad Scientist: It's time to put your fucked-up scientific knowledge to good use. Can perform a single ninjakill once per game, that leaves behind no evidence.

Third Party:

Yeti: You can side with either the Survivors or the Traitors. If you're the one that gets voted out, you can choose one person to be executed in your stead, and you'll be given your own escape pod to leave the map.

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