Ghost Train - Types of Hunters

Jeb grabbed the Soul Hammer and held it close to his chest in fear.  Through the limited periphery of the gasmask, he could see the electric blue glow of one pissed off spirit.  Andrux was in front of the crew facing the ghost.  He carried a large Aether Shield and Jeb was glad he was behind it....

Ghost Hunters, Bulls of the Line, Spirit Miners, Enforcers...whatever we call them, they are the characters that a player has access to.  I want there to be at least nine types of character, each with variations so that your choice of up to five is somewhat difficult.  Do you take another DPS guy, or a Librarian?  Pick a tank or another trapper?

The type of ghosts will also effect which characters are most effective and it might take a few tries of different combinations to capture the ghost.

I'll use terminology from other games to explain the types of characters and what they do:

1. Tank or controller.  This character draws the attention of ghosts and redirects their attacks away from other characters.  If you had a ghost in the middle of a train car, you could move the tank to one side and have it draw the attacks and the rest of the chars on the other side draining the ghost.
2. Trapper.  Think of this guy like the Ghostbuster who has the trap.  He's there to catch the ghost when it is mostly drained.  It's a delicate balance.
3. Striker 1.  Damages ghosts with a weapon (Soul Hammer or Spirit Axe, something neat).  This one does fast damage, but small amounts.
4. Striker 2. Like the other striker, but very slow attacks dealing lots of damage.
5. Striker 3.  Area of effect damager.  Useful for multiple ghosts.
6. Sheild/Defender.  Kind of like a tank, but does a bit of damage for it's high armor.  Might just combine this with Tank.
7. Librarian.  Wears aetherial goggles and spots ghosts.  Maybe knows lore/weak points of ghosts.
8. Healer 1 - Heals a team member with lots of damage.
9. Healer 2 - AOE healer.

Each character only has one action/power.  This is a skill level thing where there is a chance at failure each try.

Characters have a few stats:
Class (as above, though want more atmospheric names)
Spirit - This is their health bar
Speed - How fast they move back and forth on the train

In addition, each power has a subset of stats like how much damage, how long it lasts, area of effect, chance to succeed.

Speed concept.  Going for a Victorian era, post-apocalyptic miner/engineer sort of vibe.