Combat Medic: The two "Repairers", the Omega and the Pandemic, are quite able to hold their own in a fight.
Chain Lightning: The Pandemic has not one, but two chaining abilities. One is a chain heal that heals the Pandemic before bouncing to teammates, and the other is a chain laser that strikes the targeted enemy before bouncing off to others.
Crystal Prison: Of a sorts. The Deluge can imprison a targeted vehicle and any of his nearby allies in an energy field for a brief time.
Dishing Out Dirt: The Colossus can cause an earthen ramp to rise from the ground, surprising enemies by walling off routes or screwing up their escape, or providing the Colossus itself with a quick means to get airborne.
Ditto Fighter: As a curious addition to all the chainsawing, the Razor can also copy an enemy vehicle's skill. The copied skill can only be used once, and then Duplication must be used again.
Energy Absorption: A few cars can do this. The Firestorm's Heat Converter ability projects a fiery shield around the car for a few seconds, absorbing all damage. Some of this damage is dealt immediately to the Firestorm afterward, but the rest powers up it's Combustion Cone ability.
Energy Weapon: Many skills exhibit this, but there's also the plasma cannon weapon.
Empathic Healer: The Bulldozer has two skills about sharing damage. Chain Bonds binds the Bulldozer to a teammate, allowing them to share damage but also healing effects. Barbed Bonds inflicts this on an group of enemies, while also causing damage over time to each.
Life Drain: Several vehicles can do this. The Bulldozer can do so with ordinary weapon attacks via a skill, the Omega can fire a grenade that transfers health to teammates, and the Titan can fire a special projectile at a target.
Make My Monster Grow: The Avalanche's "Big Boss" skill causes the vehicle to increase in size dramatically, causing it to bash aside enemy cars on contact. As a bonus, the Sound Wave skill is more effective while huge.
Mana Meter: Keep an eye on your Energy Meter while you're firing off those skills. It doesn't regenerate very quickly, so you'll need to pick up yellow-colored energy powerups to quickly refill it.
The Medic: The Omega and Pandemic, of course. The Omega's heal only targets a single teammate and it is incapable of repairing itself, but it's a larger heal then the Pandemic's Chain Repair skill.
Mighty Glacier: The Tanks and Defenders all feature slow speeds but heavy basic armor.
Nanomachines: The Deluge can fire a swarm of them, which damage enemy vehicles they come into contact with.
Ninja: The Ghost motorcycle is a Ninja on two wheels. Not only is it fast and nimble, it fires up-sized Shuriken and can Smoke Out to escape!
Nitro Boost: Every car comes equipped with a fast-recharging, free to use boost ability. It can be replaced by one of two powerups found in the arenas- one grants a faster boost that ignores gravity while in use, allowing the player to clear large gaps. The other replaces the speed boost entirely with a jet boost that enables a Double Jump.
The Paralyzer: The Colossus' Seismic Shock ability sends out a shockwave that paralyzes nearby enemies briefly. The Firestorm's Meteor ability also inflicts this on impact, with the added plus of dealing damage. The Apocalypse can do this simply by ramming.
Playing with Fire: The Firestorm buggy's skills are all themed around fire or explosive effects. For bonus points, equip it with the flamethrower in keeping with it's short-range skills. The Ghost also dabbles in this with it's Incendiary Grenade skill.
Shock and Awe: The Tempest can fire a blast of electricity at a target, with a chance for damage over time.
Shout-Out: One of the Firestorm's skills is called Punchers Impact. It transforms the car into a molten meteor (which looks like the developer's logo) that slams down, inflicting paralysis and damage on nearby enemies.
Smoke Out: The Ghost motorcycle can do this. The smoke is effective enough that it prevents enemies from targeting the Ghost, giving it time to get away.
Status Buff Dispel: The Pandemic's handy Dispel skill removes debuffs from friendlies, buffs from enemies and even damages said enemies slightly! All this with added area of effect functionality!
Standard Status Effects: Many vehicles have a debuff ability, most commonly loss of speed or damage over time. Fancier debuffs often come from the "situational skills", such as armor penalties. How the slowing effect is delivered varies. The Titan can project a field around itself that slows enemies that get too close, while the Pandemic can coat an area in goo that both slows and damages foes.
Status Buff: Besides the healing from the Omega and Pandemic and the Calamity's energy restoration, the Apocalypse's Catalyzer skill increases movement and attack speeds for itself and nearby teammates.
Stuff Blowing Up: All over the place. Special mention goes to the Apocalypse, whose ultimate skill summons a god damn SCUD.
Special Attack: Each vehicle has four, with wildly varying effects and energy costs. Some of them aren't "attacks" of course, such as the Zero summoning it's drone and healing skills.
Spin Attack: The Firestorm's ultimate attack sends it into a whirlwind of flame, damaging anything it contacts, while the Tempest's ultimate transforms it into a tornado.