Board Thread:Questions and Answers/@comment-29680061-20170613161817/@comment-26369723-20170711083835

"My human soul, my determination. They were not mine, but YOURS." I don't buy the "Chara is evil, manipulative child from the very begining and posseses poor ol' Frisk" thing. They basically tell you that you were the one who chose to kill everything in sight, and so, from the LOVE you gained, Chara's soul awakened, and based his thinking on your actions.

Then again, the interpretation is up to the player, so what your thesis is as valid as mine.