Board Thread:Questions and Answers/@comment-29680061-20170613161817/@comment-31069347-20180105045624

There is plenty of evidence that Chara is Evil and it is not dependent on player choice

There is an argument that the player is pressing the fight button, however that is only the case until the very end. The player never hits the attack button for the Final Sans Hit, Asgore, or Flowey. Thus the obvious conclusion would be that it is Chara's doing as the player has no control over these actions

Otherwise, There is what Asriel says when in the ruins after the seal is broken, quote "Chara hated humanity"  he also explains that Chara would never tell him why he/she hated humanity. he further goes on to say that when He and Chara combined their souls, Chara's spirit was still strong enough to partially control their combined form. He also states that Chara was the one who picks up his/her own body and brings it to the village, wanting to use their full power to kill the humans of that village. Asriel resisted and managed to stop Chara, which consequently resulted in Asriel's Death, Both Souls being released, and Asriel ending up as Flowey.

Lastly, if the player completes Genocide and then gives up his/her soul and then does a True Pacifist, Frisk's body is clearly taken over by Chara so Chara can destroy humanity. This lines up clearly with Chara's hatred for humanity and wanting to destroy them, especially since Chara's only way out of the underground in genocide is to absorb Asgore's soul, which Flowey (Asriel) destroys. Thus it's a logical conclusion that Chara would force The Player to give up his/her soul  in return for restoring the world in order to get out of the Underground via True Pacifist Ending

This is all info that can be found in the game. Chara is Evil and it isn't dependent on Player choice as Asriel admits that Chara had evil intentions before Frisk fell into the underground. It's silly to say that Chara isn't evil in the other routes as this would be a non-point considering Chara is simply a mentioned person in Neutral and True Pacifist and is not actually seen unless the player does a True Pacifist after a Genocide (where Chara is depicted as Evil). It also would contradict what Asriel says about Chara at the end of True Pacifist, saying that Chara is evil in the True Pacifist Route.

That's my conclusion