Ganondorf > Sonic > Lucas > Ness (?) Samus > Kirby
GANONDORF: ...CAN NOT be killed by anything but the Silver Arrows and (arguably) the Master Sword while he has the Triforce of Power.
This is a proven fact, and has been demonstrated many times over the course of the Zelda series. The Silver Arrows of Zelda 1 and A Link to the Past have since become the Light Arrows, which can do no harm to him (only STUN him). I say that it is argueable that the Master Sword can kill him because, as seen in the ending of Twilight Princess, Ganondorf is able to stand and even talk while having the Master Sword impaled through his chest. It is not until the Triforce of Power leaves him that he 'dies' (presumably; he remains standing upright).
TL;DR version: If you don't have the Master Sword, Silver Arrows, or something else that "sparkles with the power to repel evil", then you cannot kill Ganondorf. It's that simple.
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SONIC: ...Is
INVINCIBLE while transformed into Super Sonic.
It has been proven time and time again that the only thing that can hurt Super Sonic is another Super Form (E.G., Super Ix). The transformation can be achieved in seconds and grants him Supersonic Speeds (more than he already had), the ability to fly, and makes him Invincible. The transformation lasts, at most, a total of
83 minutes and 15 seconds (assuming Sonic has 999 rings, losing them at a rate of 1 ring per 5 seconds ala Sonic Unleashed). The greatest example of Super Sonic's speed and power are in the Sonic Unleashed opening (see
here: http://www.youtube.com/watch?v=P8IxgooL480, skip to 1:30 if you're impatient). He literally plows through Eggman's fleet, anhiliating anything in his way. And, if the backdrop of Earth is any indication, he could very well be traveling at speeds beyond Mach 10.
I'm not even going to go into normal Sonic's powers at the moment, that's pretty much it.
TL;DR version: Super Sonic is like trying to outrun a nuclear missle for 16 minutes, except the missle is much smaller than you (Sonic is only 3 feet 3 inches, 100 centimeters) and can stop time. The only thing I can think of other characters doing to him is Samus slamming him with a Darkburst, but he's far too fast to be hit in the first place. The only thing preventing him from being top is the fact that Ganondor is virtually unkillable.
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Lucas: ...
Is virtually the same as Ness, but has a few key differences.
Namely the fact that Lucas's defensive game is better than Ness's. He can last longer. With Powershields, a wider range of PSI, and a unique health system, he's just plain hard to kill. Lucas and Ness have a special "scrolling health" system. When they take damage, they don't feel it all at once. Instead of a health bar, they have a meter that goes down like an Odometer (the thing on your dashboard that measures milage). When they take damage, the meter scrolls. While their health goes down (even if they've taken Mortal Damage), they can still defend themselves, attack, guard, or heal their HP. If they're guarding, the gauge scrolls slower, letting them live longer until their next action. Basically, killing them is a long and frustrating process. What sets Lucas appart from Ness, however, is his options. Lucas's health scrolls slower then Ness's by itself, making him live longer already. Powershields and PSI Shields lessen damage taken by half, along with dealing damage to your attacker in return (even from projectiles, or laser beams). They both have PSI Lifeup, a skill which allows them to fully restore their HP (so long as they have the Psychic power to preform it). In addition, Lucas has Seven 'Mementos' given to him by important characters in his game (no spoilers). In the event Lucas looses all of his health and passes out, these will revive him in full.
TL;DR version: Lucas is simply the better defender, able to last longer in battle. His endurance will allow him to keep pounding his opponents until they loose, unless of course your opponent is a Super
Sayian hedgehog or named Ganondorf.
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Ness: ...
Is virtually the same as Lucas, but lacks his endurance.
Ness just cannot last as long as Lucas can. Although they both have virtually the same powers, techniques, and weaponry, Lucas lasts longer. Ness doesn't have any Mementos to revive him, or a rusty Odometer. He does, however, have Powershields and PSI Shields, which is enough to keep him alive long enough to defeat anyone below him on the list.
TL;DR version: Oh come on, it wasn't even that long. Read it. Now.
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Samus: ...
Has a massive range of weaponry, firepower, and defences.
Her power suit (or whatever suit she may be wearing at the time) is a virtual stronghold, the ultimate weapon AND armor. It has a variety of upgrades. Its immune to intense temperatures (hot or cold). It can curl up into a ball only a few feet across. There's the Speed Booster, letting her accelerate past the speed of sound (letting her keep up with Sonic and Kirby, although Super Sonic outclasses her). Then there's the Space Jump, which lets her jump indefinitely through some crazy space technology. And the famous Screw Attack, which surrounds her in a devestating energy field that leaves her almost invincible and kills many enemies upon contact (combined with the Space Jump), this leaves deadly implications). Samus has quite the resivor of health as well. Her more standard weaponry includes an infinite supply of Bombs, along with a large quantity of beams (most stackable, all veristale, and several that home in and go through almost anything). In addition, Samus has a limited supply of:
Powerbombs: These are an upgrade to Samus's bombs. They create a massive explosion (not unlike Crash Kirby) that destroys most enemies in one hit. It fills the entire screen.
Missles: Basic missles that do a fair amount of damage. Some can freeze enemies, and some home in on targets.
Super Missles: Basically missles, only bigger, faster, and with more bang for your buck.
TL;DR version: Samus basically outclasses everyone in sheer versitality (except perhaps Kirby) and pure survivablilty. However, she can't kill Ganondorf, and she cannot get through Super Sonic.
PLEASE NOTE: I've already reconsidered Samus's placement, remembering Samus's shield-piercing beams. These could get through Ness and Lucas's Powershields, leaving their match outcomes uncertain. I don't know if they would be able to survive long enough to defeat Samus.
Consider her either between Ness and Lucas or above Lucas.
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Kirby: ...
Although he's a SUPER TUFF PINK PUFF (I can't believe I said that),
he can't stand up to the 5 Smashers above him (Any short jokes percieved are unitentional, but I'm going to keep it like that anyway because they made me laugh).
His Copy Esscences never leave due to the Copy Esscences Deluxe from Kirby Super Star. Although he's very short (only 8 inches tall, according to his official character profile on Nintendo of Japan's website), he can move very fast on his flying machines (and as Jet Kirby) and can dish out ALOT of hurt. Kirby moves at a top speed of 800 miles per hour (rough estimate based off of Kirby Air Ride info) on the Hydra, his Air Ride machine. While flying about on whatever vehicle he's in, he ususally can keep an ability to punish the opponent with while he flies. In addition, Rock and Metal Kirby are almost invincible, as is Mirror Kirby's shield. However, they can still be crushed.
TL;DR version: Kirby is a GREAT character, but he's just not as good as everyone above him. Sorry, my little pink friend.
If you have any issues with my analysis, just quote it in a response.