Board Thread:Questions and Answers/@comment-27327020-20160404174206/@comment-373131-20160504202758

It seems pretty absurd that there's even debate between Asriel and Chara. Asriel, with his "infinite" power, can come close to ending the world, and can almost kill one determined human child. Chara can destroy said human child, all savestates, and all timelines in one swing.

That easily secures Chara at the top of the list.

In second, we have Angel of Death Asriel, who certainly has a lot of power, but if it were truly, any one single hit would destroy Frisk utterly.

In third of course is Omega Flowey, with six SOULS to Asriel's seven, and the ability to SAVE, LOAD, and hack the game to do various unpleasant things. However, it is important to note that these SOULS have been drained of much of their determination and therefore power, and even still they're able to break free of Omega Flowey's control.

In fourth are the Amalgamates, who have been injected with so much Determination that they are no longer capable of dying. They're still plenty capable of attacking though!

In fifth place I put Frisk. Unlike the various monsters who "stand there and take it", Frisk... moves out of the way. However, at his most determined, he doesn't need to, because his soul can patch itself together.

In sixth place is sans. He's overcome his own weakness with his intelligence and his screw-the-rules attitude. While his attacks only do one damage, he'll spam the hell out of them-- regardless of whose turn it is. He's still weaker than Frisk though despite everything, because Frisk is able to use the very same tricks sans does (dodging, attacking out of turn). However, even when Frisk fails to dodge, he can still take a few hits and Frisk can keep fighting forever, while sans eventually runs out of steam. If sans was as indefatiguable as Frisk, there wouldn't BE such a thing as a "genocide ending"

In seventh place is Undyne. The only monster known to have innate determination in her soul, Undyne can pick herself up after being sliced in half and become one of the scariest things the Underground had ever witnessed. Also the only monster to survive multiple hits from a Chara-possessed Frisk, she's just plain scary tough. However, she doesn't have anything really special to bring to her arsenal besides gross physical durability and powerful attacks.

In eighth place is Asgore. If he wanted to, he could end you. But he doesn't want to. For all his power, his big heart repeatedly continues to be his undoing. he even had the six human SOULS right there the whole time, and didn't take them. But he's still got heaps of physical bulk and some really scary attacks.

In ninth place is Toriel. Her firey attacks are difficult to avoid even when she's clearly holding back. If she didn't love you dearly, she could have been a really scary fight.

In tenth place I put Papyrus. A shame the big doof takes the altogether wrong approach during a genocide run, because his strength and toughness were enough to impress even Undyne. But because of his big heart, he's the only monster you fight who is literally and entirely incapable of killing you-- in ANY route.

Honorable mention: Jerry. Even Chara can't be bothered to kill him because it takes forever.

NOT CONSIDERED and WHY:

Annoying Dog: You never fight this critter, so we don't know what exactly it's capable of. Being annoying might just be the limit of its power. "but it's the creator avatar" people say... well, so's Temmie, but Temmie isn't even that hard a fight (though some of her attacks are plenty able to cause nightmares).

W.D. Gaster: Too little is known about him. And by too little I mean pretty much nothing. Also he doesn't exist.