Frisk

Frisk is the main protagonist in the 2015 hit indie title Undertale. If the player decides to do it, however, Frisk becomes a avatar of one of the main antagonists, being The Anomaly.

Biography
A lot isn't mentioned about Frisk's back story making it purposely vague just like with Chara. Reasons for climbing of this may parallel with Chara's hatred for humanity or The Anomaly controlling Frisk. Asriel also hints out that there is one reason for Chara climbing Mount Ebott for a very indeterminate intention that Asriel himself says in a saddened and depressive way, hinting out a possible suicidal attempt similar with Chara.

In Undertale, Frisk is controlled by the player. While these actions are controlled by the player and as hinted Chara. It does not mean that Frisk is in the right for committing the genocidal acts of killing others one by one. With the last help being by Flowey with killing Asgore at the end.

Trivia

 * Frisk only qualifies as a villain for only the Neutral Route or Genocide Route played through by the player. Their villainous acts are dependent on the player's choice.