Meet TwoFace! He's Poker's older brother. His parasitic, shadowy nature makes him an internal threat or a representation of negative energies.
He's the Guardian of the "Dark Dilemma." He influences the conflicts, identity confusion, and personal conflicts within other characters, and can also manipulate the inner weaknesses of monsters and humans-in short, anyone. He's also a Cannibal, while Poker can be considered a Vampire. TF (TwoFace) is a manipulative, dangerous, highly intelligent creature, a being whose face you can't see. He's not really "Sans," nor is his "True Form" his true form. He's a shadow or an entity without a specific body; on the contrary, he possesses multiple bodies and multiple personalities. He's born in what he calls his "TrueForm," but when his younger brother Poker is born, he sees him and creates a body resembling him to avoid frightening him. He can enter anyone's mind and display hallucinations and illusions, both real and unreal, and no one can grasp or understand what's real or fake. He can transform into anyone, and just like Cross, who possesses the TrueForm, he can infuse his own soul with his own powers, transforming them into his own creations. Soon, you'll see Shadow Cross. When TF possesses Cross's soul, he inflicts unspeakable pain upon Cross, taking his soul under his control and creating Shadow Cross. SC (Shadow Cross) can't escape TF's control in the slightest, and if this happens to others, they too will be unable to escape TF's control. He can always know everything. In other words, he can know everyone's past, present, and future. He's a highly intelligent and cunning creature. He's his mother's creation. You could say Mrs. Gass raised him this way. He can also easily control entire universes. He'll always be watching you from the shadows or through the eyes that appear directly around him. Poker can control everyone, but it can't control TF because TwoFace shows him another face the moment he tries to control it. Multiple faces, multiple personalities, multiple variations.