Board Thread:Questions and Answers/@comment-27327020-20160404174206/@comment-13682699-20160605223916

This only takes into account their current & most powerful forms

1) God of Hyperdeath - asriel as a literal god. basically the only person more powerful is Toby himself as the creator

2) Omega Flowey - flowey with six human souls, so its simply one step down from godhood. can have multiple save-states and can create/destroy the universe as he pleases

3) Frisk/Chara - with the most determination available, they control time to a certain extent with the power of save/load/reset/erase. at their most powerful they have the power to tear apart the universe and even withstand the most powerful blast from the God of Hyperdeath

4) Undyne the Undying - the epitome of a monsters potential, combining magic with determination without the use of a human soul as well as being a highly skilled warrior from her training through Asgore himself. She has the highest stats in game and is the only one capable of withstanding a hit from the player with high LV. She is possibly the strongest monster to have ever lived, surpassing even Asgore in this form. She likely cant hold this form for too long even with her renewed body because she is still a monster and the excess determination would likely still melt her after a while even without killing her in that form.

5) Asgore - the King of Monsters. as the most powerful species of monster, the Boss Monster, he is already leagues above most typical monsters in strength which shows from his stats that is tied with only one other as being naturally the highest amongst all monsters. even during his fight he is shown to be withholding much of his power during due to his reluctance to kill a child. he taught Undyne all he know about fighting and has lived throught the war between monsters and humans, so not only is he powerful, but he is a very experienced and wise fighter.

6) Toriel - the sole other person who shares the same stats as Asgore, she is also a Boss Monster, which means she is also stronger than most monsters naturally. As another who lived through monster-human war, she is very experienced and smart. even during her fight she, like Asgore, was holding back due to her reluctance to hurt a child. while she may have been a powerful fighter in her own right, since her leaving to the ruins she has had little reason to ever fight at all, which has probably dulled her combat ability. Make no mistake though, she still posseses great control over her power and can still wield it to defend herself if need be.

7) Sans - everyone knows how strong Sans can become if he is pushed enough. his attacks are similar to his brothers but far more complicated and with the addition of the Gaster Blasters he becomes a formidable foe and is. his next most notable feature is his ability to dodge your attacks, which makes it even harder to fight him despite his abysmal stats. Sans isnt strong because of his stats, hes strong because he fights smart and if he is fighting you, he is likely trying to kill you so he will resort to using any means necessary to take you down, even if it means playing dirty. the last but most notable feature of Sans is his ability called Karmic Retribution(KR) which inflicts a poison that increases in strength the more sins they bear. due to his attack being only one, it allows him to circumvent invulnerability frames and continuously hurt you the longer you stay within an attack at the speed of your computers fps (about 40-60), leaving the KR to finish the job. because he is lazy and not a true fighter, he has little stamina and will stop to rest when hes tired instead of pressing on till his last breath like a warrior would.

8) Mettaton - built to be the ultimate human killing machine, mettaton is simply a machine with a monster soul, which automatically makes things difficult because unlike monsters, he cant be destroyed easily with one blow because he is made of physical matter (metal in fact) unless he activates his NEO form which is his most vulnerable form that will allow him to be killed easily. in most other circumstances, his defense is super high which would make him hard to defeat in general. however, metatton is entertainer at heart and not much in the way of a real fighter despite him being built for it, so while he may be strong being a machine built for killing humans, he will only fight if it allows him to further entertain his viewers, which he does on occasion.

9) Papyrus - Sans's little bro. Like his brother he uses similar bone/blue attacks. Unlike his brother though Papyrus is really strong. Undyne even testifies this by saying that he is WAY tougher than he looks and would be a good warrior if it werent for his personality. He would never truly want to hurt someone so his potential is great, but he is subconciously holding himself back due to his niceness.

10) RG01 & RG02 - I only put them both here because they always fight together and likely always will (I could never separate such a nice couple). They work together very well and are probably the next strongest actual fighters besides Undyne herself. A bit clueless at times but still capable when necessary.

Honorable Mentions:

W.D. Gaster - only based on his stats in game files

Amalgamates - considered to be practically unkillable by standard means, likely due to their determination. unknown if it even is possible to kill them.

Gerson - Hammer of Justice aka a VERY old war hero. Probably as strong as Undyne was back in the day and with his experience he was likely a worthy adversary. Could probably still kick some ass, but he's probably too old for that now.

I would like to take a second to go over my position with sans as to why he is not as high on this list as most people claim him to be becuase i know that people will be asking about this, and there are at least three reaons.

1) He isnt a TRUE fighter/warrior - hes simply a monster who has nothing to lose anymore and is trying to save the universe from being erased. a simple sentry guard who is trying to fulfil his duty and take revenge against his brother and all of his fallen friends to defeat a foe that can practically destroy the universe with enough LV. Granted, with his knowledge of the save/load function, he has much more information than practically all other monsters about how to deal with you, which is by playing the system. He knows that despite your ability to come back with the save/loads that you are stil limited to what you have been shown is possible through the combat menu so he plays dirty to make up for his lack of ability to kill you quickly. (The only other person to manipulate the game in this fashion is Asgore with his ability to destroy your mercy option, though he only does this as a form of self-punishment because he doesnt believe he deserves it.)

2) The surprise factor - most people wouldnt expect him to be so strong as his is. it throws so many people off and he KNOWS that and is willing to use to his advantage as much as he can. of course it can only work for so long since the player can eventually learn his patterns and get him that way which he knows as well. on top of that he also uses very unorthodox methods of attacking that the player isnt used to like hurting you on your own turn and utilising KR which, with the addition of nullifying iframes with his low attack power, leaves you open to continuous attack and makes him even more powerful against truly evil people.

3) He is the weakest enemy - Sans knows that he is the weakest person in the underground and he knows he cant truly kill you, so what is he doing then? he's trying to make you give up. to frustrate you so much that you RAGE QUIT, realize your mistakes and do things over as a good person would. It would only take one hit to kill him, so he learns to dodge which increases your frustration at ever trying to hit him. (By the way, while he is the only one who is shown dodging attacks, its not something that is implicitly against the rules. Its simply only shown here because its necessary at this point, plus the player is capable of dodging. Sans is simply doing what the player is capable of not to mention that he is a sentry so he does know how to fight to some degree. Asgore is the other person mentioned at being capable of doing this, but because of his reluctance and to make the fight as fair as possible, he takes every hit) people usually equate frustration in dealing with opponents = strong fighter which isnt necessarily the case. He just knows how to deal with you and what to do to make you want to quit. if he worked like every other monster then he would have died instantly so he has to change things up.

Please do not take this as a way to downplay his abilities. Its simply putting him into perspective as to why people would think hes so powerful after watching/playing against him. He is strong against people who dont know what he is capable of and plays smart to make up for his weakness which is why he tries to stay mysterious the whole time, but against a true fighter such as Asgore or Undyne or even other members of the Royal Guard, he would stand little chance because he lacks stamina and HP like they would to outlast them because of his laziness. If he were to train as a warrior, his abilities and his smarts combined would probably make him VERY strong, maybe enough to rival or even surpass Asgore. However, because he is lazy, something that is part of his character in general, we will never truly know. Just know that I have mad respect for his power and he is NOT someone to take lightly in any case if he ever became serious.