Board Thread:Questions and Answers/@comment-27327020-20160404174206/@comment-25181180-20160406092430

But what if Chara sucked Frisk's ability or some sort? I mean, Chara is a spirit/dead, and due to their determination, Chara could simply suck Frisk's ability, thus doubling Chara's strength, making Chara able able to erase the entire universe with a doubled determination.

I wouldn't say Chara is weak, but considering Frisk's ability to infinitely cheat death during the True Pacifist Route and undo all of his actions (albeit limited), we could say that half of Chara's strength during the Genocide Route finale is from Frisk. If Frisk somehow knows Chara's existence, then he could've grasped into his own determination and cheat death.