Yes!
Awesome.
Plants
Zombies
Who's who and how they match up!
Cactus / Captain DeadBeard -- Snipers
Sunflower / Scientist -- Medics
Citron / Imp -- Tanks
PeaShooter / Soldier -- Soldiers
Rose / Super Brainz -- Support... kinda.
Cornel Corn / All-Star -- Gunners
Chomper / Engineer -- Technical
The above characters are the most basic of them all... Collecting Sticker Packs and completing objectives gets you literally hundreds of variations of the characters. There's Fire types, Electric types, Poison types... and so many more! Add on top of that, Customization Stickers that change the Look (Hats, Tatooes, Gun Skins, Facial Expressions, etc) --AND-- the Special Attacks --AND-- the Gestures... There's literally THOUSANDS of items to collect throughout the game!! There are also Common, Rare, Super Rare and Legendary variations of everything, as well! Did I mention AI plants and zombies you can plant and raise to add to the ruckus? There are also defensive plants and robots, very similar to the tower defense items of the original games, too!!
This game is NUTS!! 
Unlike other shooters, there's a time and place, game-mode and game-play necessity for each and every one of the characters! They are ALL fun to play!! 
Played some online multiplayer and had lots of fun. Pretty much what I was expecting. Look forward to picking this up pretty soon.
Cactus
Primary Weapon -- Spike Shot -- Sniper!
Ability 1 -- Potato Mine -- Yep, the same mines from PvZ!
Ability 2 -- Garlic Drone -- Launch a fully controllable, flying garlic bulb and kill Zombies from above!
Ability 3 -- Tallnut Battlement -- Again, from PvZ; You are fully vulnerable while controlling your drone, why not set up some defensive walls?
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Captain Deadbeard
Primary Weapon -- Scurvy Scattershot -- Shotgun!
Secondary Weapon -- (Holding Left Trigger to Aim) -- Sniper!
Ability 1 -- Barrel Blast -- Hide in a barrel, increasing your defense dramtically, then light the fuse and run into a group of plants!
Ability 2 -- Parrot Pal -- Fully controllable, flying drone parrot!
Ability 3 -- Cannon Rodeo -- Straddle a cannon and rain death from above!
Sunflower
Primary Weapon -- Sun Pulse -- Semi-Automatic Sun-Ray gun! Pew! Pew Pew!
Ability 1 -- Heal Beam -- Attach a beam of sunlight to a plant to heal it!
Ability 2 -- Sunbeam -- Plant yourself and release a high-powered sunbeam of Zombie searing death!! Very vulnerable!
Ability 3 -- Heal Flower -- Drop a happy little sunflower pot for a stationary healing... station. Can also heal the Sunflower!
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Scientist
Primary Weapon -- Goo Blaster -- Shotgun!
Ability 1 -- Heal Beam of Science -- Attach a stream of dark matter to a Zombie and heal it! Can alternatively choose to drop a healing station!
Ability 2 -- Warp -- Warp!
Ability 3 -- Sticky Explody Ball -- Grenades that stick to anything, friend, foe or the environment... Only explode when they come into close proximity of a plant, harming ONLY the plants!
Citron
Primary Weapon -- Orange Beam -- Lazer Beam!! Don't let it over-heat!
Ability 1 -- EMPeach -- Stuns Zombies, freezing them in place. VERY effective on the Imp's Z-Mech!
Ability 2 -- Citron Ball -- Rolls up into orange form, like Samus or Sonic! While in ball form you can dash, transform back at will or charge dash into Zombies... Like Sonic!
Ability 3 -- Peel Shield -- Raises a shield in front of Citron that stays for quite a while but CAN also be destroyed! Remember to face your attackers when this is on!
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Imp (Z-Mech)
Primary Weapon (Imp) -- Imp Blasters -- fast-firing laser blasters!
Ability 1 (Imp) -- Gravity Grenade -- Lift plants into the air and keep them still. Careful! They can still fire back!
Ability 2 (Imp) -- Robo Call -- On their own, the imps are weak; call in the mech to become a force to be reckoned with!
Ability 3 (Imp) -- Impkata -- Engage your butt rockets and spin in a circle on the ground, firing your blasters into the crowd. Excellent for crowd control!
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Primary Weapon (Mech) -- Robo Laser -- Laser Gatling!
Ability 1 (Mech) -- Missle Madness -- Fire a barrage of missles!
Ability 2 (Mech) -- Explosive Escape -- The mech self-destructs after some time. DON'T be in one when it does! You can eject early with this button... Perfect for when you're in a group of plants!
Ability 3 (Mech) -- Robo Stomp -- Shockwaves damage the plants surrounding the mech!
Peashooter
Primary Weapon -- Pea Cannon -- Rifle.
Ability 1 -- Chili Bean Bomb -- Grenade!
Ability 2 -- Pea Gatling -- Plant yourself and mow down some zombies! Vulnerable!
Ability 3 -- Hyper -- High speed dash; lasts a while, allows for super jumps!
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Soldier
Primary Weapon -- Z-1 Assault Blaster -- Rifle!
Ability 1 -- Zombie Stink Cloud -- Smokescreen, but also harms Plants!
Ability 2 -- Rocket Jump -- Propels you pretty high upwards; use after a jump for added height. Good for getting into high ground for a good tactical advantage!
Ability 3 -- ZPG -- RPG!
Rose
Primary Weapon -- Magic Thistles -- Homing shot!
Ability 1 -- Time Snare -- Slows time; pretty good area of effect!
Ability 2 -- Arcane Enigma -- Rose becomes an incorporeal cloud; cannot be harmed but CAN harm Zombies!
Ability 3 -- Goatify -- Turns Zombies into Goats! Watch out, they can still attack!
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Super Brainz
Primary Weapon -- Heroic Fists -- Punch! Melee attack!
Secondary Weapon (Holding Left Trigger to Aim) -- Heroic Beam -- Beam attack!
Ability 1 -- Super Ultra Ball -- Long range, large, energy projectile attack!
Ability 2 -- Turbo Twister -- Spin like a tornado, continuously damaging all plants you come into contact with; also boosts defense!
Ability 3 -- Heroic Kick -- Close the distance between you and a plant! Also does good damage on contact!
Colonel Corn
Primary Weapon -- Cob Busters -- Heavy machine-gun!
Ability 1 -- Butter Barrage -- Toss a hot potato to call in an aerial butter strike. Great area of effect!
Ability 2 -- Husk Hop -- Jump over your enemies in a large, high arc, firing downwards as you go!
Ability 3 -- Shuck Shot -- Corn missle!
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All-Star
Primary Weapon -- Football Cannon -- Heavy machine-gun!
Ability 1 -- Imp Punt -- Imp grenade!
Ability 2 -- Sprint Tackle -- Powerful dash to propel yourself to and through your enemies!
Ability 3 -- Dummy Shield -- Erects a tackle-dummy to block attacks!
Chomper
Primary Weapon -- Chomp -- Melee bite! Do enough damage to swallow your enemies whole!
Ability 1 -- Goop -- Slow your enemies and make them unable to attack; set 'em up for a Chomp or attack by your teammates! Good range!
Ability 2 -- Burrow -- Burrow underground and either stay still to preserve energy and ambush your foe or chase 'em down; time it right for a one-shot, swallow you whole, kill!
Ability 3 -- Spikeweed -- Snares Zombies to set 'em up for whatever attack you choose; pair with Burrow for easier kills!
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Engineer
Primary Weapon -- Concrete Launcher -- Heavy Machine-Gun!
Ability 1 -- Sonic Grenade -- Stuns enemies to stop them from using attacks momentarily!
Ability 2 -- Big Bolt Blaster -- Plant a mounted machine gun! Powerful but vulnerable!
Ability 3 -- Jackhammer -- Ride a jackhammer to... drain your Dual Shock's battery...! Also good for damaging foes and burrowing Chompers!
Keep in mind, all the characters listed above are the most BASIC, non-variant ones! Besides often adding elemental attributes to the Primary Attacks, some variants will give you altogether different Primaries.
For example, take the Alien Flower:
The Alien Flower exchanges the Sun Pulse attack for one that shoots out a cloud of damaging spores that can hit more than one Zombie!
Then, there's Customization Items that completely change the looks of your characters and variants...
Thousands of characters, items and attacks to unlock...
Thousands!
Thanks for taking the time to make this guide Leo, it's very informative and will be quite handy. 
Before I spent a good, long time with the game, I was completely overwhelmed with all the different characters, their functions and attacks. Once you get to know the basics, the variations are easier to decipher and you can find characters that suit your play-style. You WILL be encouraged through the Quest Board to try different characters and game modes; they'll also challenge you to vanquish X number of enemies using certain attacks, etc. There will also be times when you go to play online when the side you want is full and they'll place you on the Zombies or Plants team randomly, so knowing a few different kinds will be helpful. With the exceptions of maybe the Imp, Rose and the Engineer, I'm constantly rotating who I play. They really are all fun and useful!
Believe it or not, even with everything I've described here, there's soooo much more I haven't mentioned... You'll be awed just how much content this game REALLY has!
Nice. I'll probably download it later tonight. Will my game carry over if I buy a physical copy of the game later on?