Chara

Chara is the main and hidden villain of Bonetale. They are encountered on the Hard levels of difficulty, in three phases.

Both the Enemy and Character Frisk has the ability to transform into Chara, which will increase their attack damage and speed.

Phase 1
Phase 1 can be encountered on all Hard levels, Demonic, and on all levels of the UnderFell Event. In this phase, Chara's speed and attack speed is noticeably faster, and their attack power is raised. They can and will kill any character (excluding Undyne the Undying) with one hit.

Phase 2
Phase 2 can be encountered on Hard levels 2, 3, and Demonic. They walk and attack a bit faster (having at least five strikes per second), and can destroy certain attacks, notably, Sans's Bones. Again, they can and will kill any character (excluding Undyne the Undying) with one hit.

Phase 3
Phase 3 can be encountered on the last Hard level (3), and Demonic. They are way faster, cannot be Bone Trapped, and will destroy Sans's White and Blue Bones. Phase 3's attack speed is only truly observed by being Undyne the Undying while being attacked, as they one-shot anyone else, and it's about 8 hits per second. Phase 3 Chara will occasionally fly towards the player despite being in Blue SOUL Mode, and it is not known if this is a bug or intentional.