Board Thread:Questions and Answers/@comment-27327020-20160404174206/@comment-25181180-20160405105612

Technically, Flowey's power can delete our file over and over again, and since he pretty much controls Underground in his Omega form (My World, Lv. 9999), he is roughly stronger than Chara. Plus, he can maintain his solid form while Chara simply possess Frisk, thus controlling their body.

That would also mean Frisk is pretty much the strongest, surviving a goat beam with an infinite attack and is persistent and determined enough to grasp into his/her soul and revived him/herself for an infinite amount of times.

Chara can simply lower Frisk's defense while possessing him, causing him/her to die in one hit. Meanwhile, Photoshop Flowey can pretty much reload infinite save files, meaning that he can reverse timeline all he wanted, so long as he had saved the game beforehand.

However, mentally, Chara is stronger than Flowey, as Chara can retain their memory after a true reset. Frisk also has the ability to produce infinite determination, specifically during the fight against Asriel.

But still, they're all are worthless against the Annoying Dog/Toby Fox. Because it/he techically creates the game.