Gunner - Medium Frame

Suit bonus: +5% bonus to turret damage per level.

Racial bonuses:
Amarr: +5% bonus to small laser turret damage per level.
Caldari: +5% bonus to small missile turret damage per level.
Gallente: +5% bonus to small damage to small hybrid turrets per level.
Minmatar: +5% bonus to small damage to projectile turrets per level.

All suits will have 1H/1L slot for fittings.
All suits have a sidearm for a weapon, and a grenade slot. (sacrificial AV grenade bombardment ftw)

These bonuses are pretty large, so a decent gunner should be able to make good use of this. I mean, at prototype Caldari gunner suit, missiles will be doing 50% more damage; prototype fragmented missile turrets will have around 400 splash damage if you factor in the bonus from pilots.

But before people cry OP, even if this suit was implemented:

1) you'd need someone willing to spec into a suit TOTALLY reliant on another player (the pilot) to get you kills for ISK/SP. (assuming the same multiplier (8x) for specialty suits that's another 2.5mill SP to get to proto level)
2) turret ammunition means pulling off those 20-0 scores will be much less viable.
3) besides being in a HAV, you can easily be shot/sniped out of the turret seat, just like people are now. I've seen my gunners get killed by forge guns, well cooked locus grenades, some crazy impact with walls and other vehicles, and all manner of intriguing mechanics.

"Armadillo"
After a through reworking at the hands of the minds who Designed Marauders, This class of HAV still has a Preference to Attack, as the Base Class did, But is now More Survivable then the Basic model
Ex. GAE-1 (Gallente Armadillo Enforcer Model 1)
Large Turret Hardpoints-1
Small Turret Hardpoints-2
High Slots-2
Low Slots-4
*Note, 10% Base HP Bonus*
*Per Level 5% Bonus to Large Turret Damage and ROF*

"Striker"
Designed to engage other HAVs at range, the Striker Class Enforcer is the Last word in Long Range Obliteration
Ex. CSE-1 (Caldari Striker Enforcer Model 1)
Large Turret Hardpoint-1
Small Turret Hardpoint-2
High Power Slot- 4
Low Power Slot-2
*Note 10% deduction in Base HP*
*Per Level 10% Bonus to Large Turret Range and Damage*

Taxi

(No, Not the Murder Taxis you Dogs...) Designed to Ferry Troops around the Batlefield in the Safest and fastest way Possible, the Taxi Model Scout Light Atack Vehicle sacrifices its Light Turret, for Spare Seating and slightly Increased amounts of Shield emitters and Armor Plates.

CST-1 (Caldari Scout Taxi Model One)
High Power Slots-4
Low Power Slots-2
Seats-4, one driver, 3 passengers
*5-10% Health Increase*

Raider

Designed to Move around the Battlefield and Preform attack Duties when the Situation Doesn't warrant HAV response, the Raider Class Scout LAV is designed to Suppress a Position To Minimize Personnel removed from the Front Line.

GSR-1 (Gallente Scout Raider Model 1)

Small Turret Mounts-1
Seats-3 (One Driver, One Passenger, One Gunner)
High Power Slots-2
Low Power Slots-4
*15% Decrease in Weapon Heat Build up/ Missile Refire Time*
*Per Level, Increase Small Turret Damage 10%*

Ambulance

A Rework of the Infamous Logistics LAV, This Model has packaged with Onboard Repair and Resupply Systems for those occupying it.

CAL-1 (Caldari Ambulance Logistics Model One)

Small Turret Mounts-1
High Power Slots-4
Low Power Slots-2
Seats-3 (Driver, Passenger, Gunner)
*Those inside the Vehicle get a 10hp/s armor Rep, and a 50% Cut to shield recharge time*
*Per Level, Bonus to the Efficiency of Remote armor Reps, and Shield Transporters*

Command

Also a Rework of the Feared Logistics LAV, Prefitted with a reinforcement Setting, with which the LAV Uses Power from the Propulsion System to Emit a field of nanites similar to the Triage Nanohive, to provide a area for Squads to Hold, and plan their Next move.

GCL-1 (Gallente Command Logistics Model One)

Small Turret Mounts-1
High Power Slots-2
Low Power Slots-4
Seats-3 (Do I have to keep explaining it?)
*Reinforcement Mode Reps all teammates 50hp/s within 15-20 Meters of CLAV*
*Per level, increase in the efficiency of Shield/Armor Resistance Amplifiers*

Light suit with extra equipment "Insurgent".
Light suit with a focus on OHKs (nova knives, shotgun, pistol) but fragile "Assassin".
Medium suit with bonuses to reps and injectors "Medic".