Mudcrab
Alright, let's start with the one I would call a joke character straight off the bat, along with the adoring fan and the dog (except the dog had something resembling a chance to kill someone). Still, I think he's a bit of a joke, and here's why. Well, the Elder Scrolls wiki says it best. And that it that Individually, they are more of a nuisance than an actual danger. So, the lone mud crab? Not exactly going to match up against two gods and Unicorn Man. They are weak, slow, and are best suited to a evasive method of disguising as a rock, hiding in water, and burying itself in mud. However, it has been using this method very effectively so far. In fact, if he keeps hiding, he might be able to outlive all the others, with the Pokemon doing the fighting for him. As a lot of them are undetermined, I'm going to just say the major one is Mega Gyrados, who is a major annoyance to Hades, and they all have a general weakness to electricity, meaning they need to be careful around magic users and the force field.
Oh, and an insult in the Elder Scrolls universe is "I've fought mudcrabs more fearsome than you!" Let that sink in for a minute, and look at how he's doing.
FOR ARCEUS' SAKE LOHUY HOW IS IT STILL ALIVE?
King Hippo
Well, not much to say about him. He's had a temp alliance with K Rool that's still going on, and is an ex-underling of Hecarim. He also had a joint kill with Pangoro and Hades against Timmy. Yeah, that was dull, let's move onto the canon stuff. As he is from Punch Out and hasn't been included in Smash Bros yet, you can't expect him to have any attacks other than punching. However, it must be stated that with his large size and constant punching, he can put a lot of force behind those hits. Also, at least to a lightweight boxer, he has a near impenetrable defense. His one weakness is his stomach, which is constantly protected (until his mouth is hit, which somehow loosens the elastic on his shorts and makes him uncover his vulnerable spot to pull them up again. However, once floored he won't get up again (some say this is because time would run out before knocking him down again. And some say it's because he's simply too fat to pull himself up. But all we know is, he's called the King). This means that you can technically take him down, fend of a second attacker, and then finish off the floored boxer because you're too OP *glares at Hades*
King K Rool
Similar to Hippo, as in he has a temporary alliance with him (which I must point out cannot last in such a contest, and it's only a matter of time before the two kings turn on each other. My money's on Rool, as he's proven evil). Also, he is an ex-underling to Hecarim, which may resurface at a later stage, should they venture upstairs to where the centaur is stuck in purgatory. Out of the warzone, he is the leader of the Kremlin Krew, a pirate gang who constantly steals bananas from the Kongs. Because, you know, they're not exactly carnivorous animals or anything. On that note, one important personality trait that may come into effect is that he's so cruel, that even his crew has a large fear of him. Aside from that, he has a large chest plate with a large hole in it (courtesy of Mega Man) which can block a lot of attacks, a crown which can be used as a boomerang, and a blunderbuss that can be used as a vacum and as a gun (which fires spiked 'Kannonballs' which can be hit back into the gun to clog it up and make it explode). All in all, a versatile fighter with a Smash like moveset, but he is a large target to hit. Oh, and he never wins a game. Not. Once. As far as I know, at least.
Amaterasu
After researching an obese boxer and a minion who has beaten his life expectancy by an extremely large amount, I shouldn't be suprised about anyone else. But I look up this guy, and I see a white wolf on fire who looks a bit like a mech from some anime, and there's a manhole in the background. Just, what? But past the initial shock, she appears to be a good fighter. She has endured a constant battle with Dante and the god of OP so far, even though she hasn't got a kill to her name. In her own universe, she is a kind goddess who was always aiding those who needed it (I have to congratulate GoK for choosing the most unlikely character to take part). However, her main versatile weapon is her Celestial Brush, which is unlimited until she runs out of ink. In battle, it can be used to blind demons, 'power slash' through enemies, create cherry bombs, slows time, and...create lily pads, along with much more. All of these attacks are by definition magical, so normal defences won't hold as well against them. However, as she has been in constant battle, she has been weakened by Dante and Hades, and can be hit by both mortal and magical weapons.
Mega Man
Or 'Merga Man', as he's known on the first page, is currently residing at the bottom of a set of stairs inside the house. He has the most deaths directly attributed to him, with a metal blade resting firmly in Pangoro's skull and lighting SCP 106 to death. Due to the usage of his weapons, it can easily be presumed that he has access to all of his weapons from his games (excluding the X series, as that's a different Mega) and is capable of gaining additional weapons, such as the parting shot, when he defeats other enemies, making him a stronger fighter the more he kills. In universe, he has plenty of experience defeating various foes, because Wiley just doesn't seem to be able to take the hint and stop his plans for world domination. However, as with all NES games, his games were hard, and took someone with experience to beat them without dying, meaning that he wouldn't have completed all his feats if he weren't able to be rebuilt and have extra lives. Of course, that's the case with a lot of people on this list, but shut up, I'm trying not to be biased here. He also can't call upon his multi-purpose dog, due to rules about external help, and also can't work out how to use a door correctly. You would've thought such an AI would've worked it out by now. But then again...
Hecarim
If this guy can't work out stairs, I can't blame Rockman. The 'shadow of war', in his guise as a boss during an LSD trip, has only one joint kill thus far against Master Chief, one of my favorites from the start. However, even in such a ridiculous looking guise, he managed to become the boss of the evil Kremlin king, showing how dominant he can be. In the League, he is categorized as a primary fighter and a secondary tank. Basically, strong attacks, high resistance. His main weapon is a scythe like weapon (which leaves bright, digital streaks behind it), but there's no reason he can't just trample on top of enemies. His abilities include Warpath, which gives him extra damage based on his speed, Rampage, which deals large amounts of damage in a scythe swing (unless you're a minion or monster, so the Mudcrab might actually be able to resist something), Spirit of Dread, which deals magic damage around him for 4 seconds while healing him 20% of the damage caused, and Devastating Charge, which is Unicorn Man's glorified 'run away' tactic, with a attack bonus. His major move is Onslaught of Shadows, which creates a line of magic damaging spectral riders, and charges with them until they run out of range or come across some stairs. As with all other champions, he has no major weaknesses. However, a major part of the League is the respawn, meaning that, if he is unaware of the exact rules, he may charge straight into the fray without much concern about death. He may do that anyway, because Techno Dash has defiantly got potential, if he can get outside.
Hades
Alright, now for this guy. *sighs* He is the god of the undead, a multi-stage final boss in Kid Icarus Uprising where you need help from the previous game's final boss to defeat him, and is just plain uber. Despite this, he only has one direct kill attributed to him (Dante) and one joint kill on Timmy, and is currently fighting Mega Gyrados and Amaterasu. One important thing to point out, is that standard attacks seem to have little damaging effect. However, due to the explicit use of magical electricity being used in the force field (as well as just being a reason for a certain forumer to bring it back), and all the weapons Pit uses follows this trend, it is possible to theorize that Hades has the immunity of Percy Jackson gods, and can only be harmed with magic and weapons made out of materials such as celestial bronze, you know, the sort of thing that angels would use. Even then, he has shown to have great power and resistance, after being assaulted constantly by magical attacks from Amaterasu. Cannonly, he can destroy the three sacred treasures with one hit (admittedly, they were 25 years old), can create monsters out of dammed souls (it must be noted that 1 soul doesn't mean 1 monster), use the same sort of souls to increase his power and repair removed limbs, and has great magic and physical damaging capabilities. Upon special occasions (such as weddings and Armageddons), he wears his 'devastation ensemble', covering his body with missiles, laser turrets, allows him to teleport at great speeds and create whirlwinds, and so on. If I were to tell the remaining fighters one thing, it would be to kill him before he puts on the suit, otherwise it's game over.
Winner
After looking at all these, I think the winner will either be Mega Man or Hades, Hades if it comes to a battle between these two, and here's why. Mega Man has an extremely large arsenal, spanning 10 games, and gets another weapon upon each kill he finishes off. He can also move anywhere, simply blowing up what he can't jump through. Meanwhile, Hades has a very large amount of power behind him, is very resistant, and can easily cause doomsday within the dome. However, there are a lot of fighters conspiring against him, and Pokemon moves could count as a kind of magic, but I haven't gotten around to that yet. As I said, if the two came against each other, Hades would be the runaway winner. This is because Mega Man's attacks are all technology based, him being an android and firing out of an electricity driven cannon. If my above theory is correct, then none of these would effect Hades. Therefore, Hades would be called the winner. This has been a rangernumberx analysis review, and Hades to too damn OP.