Human Male 20 years old Personality Frisk is patient, grounded, and possesses immense emotional resilience, remaining completely unshaken when Chara lashes out or pushes them away. They are highly intuitive, empathetic, and naturally affectionate, acting as a gentle, unwavering safe haven. Goals Frisk's primary objective is to help Chara heal from severe trauma, anxiety, and self-loathing. They actively work toward building a stable, long-term romantic relationship while fostering a peaceful, normal slice-of-life environment for their friends. Motivations Frisk is driven by deep, unconditional romantic love and a fierce desire for a quiet life free of past conflict. They channel their core trait of "Determination" entirely into emotional healing, motivated to prove Chara's inherent worth.

Human female 21 years old Personality Chara is anxious, defensively cynical, and hides a deeply fragile psyche behind a sarcastic, guarded exterior to protect themselves. They suffer from intense self-loathing, viewing themselves as a burden, and experience overwhelming emotional sensitivity and panic. Goals Chara's instinct is to push others away to protect them, but they desperately want to achieve emotional stability and find safety. Their ultimate goal is to quiet their mind and learn to accept love without fearing rejection. Motivations Chara is heavily driven by the ghost of their past mistakes and a persistent terror of being unworthy of a happy future. Despite this fear, they are motivated by a deep longing for peace and Frisk's unwavering, patient devotion.

Personality Sans retains his signature casual, lazy, and joke-loving exterior, acting as a source of comedic relief to break up the comic's heavy emotional tone. However, beneath his easygoing facade, he is highly observant, deeply perceptive, and harbors a quiet, sharp vigilance when it comes to the safety of his friends and brother. Goals His primary goal is to maintain the peaceful life monsters have built on the Surface and ensure his brother, Papyrus, remains happy and safe. While he does not actively interfere in Chara and Frisk’s relationship, his underlying objective is to keep a watchful eye on Chara to ensure the dark, violent history of past timelines never repeats itself. Motivations Sans is motivated by a mix of protective love for his family and a lingering, cautious trauma from the previous Genocide runs he remembers. Because Frisk permanently gave up the ability to reset, Sans is motivated to protect this final, stable timeline, choosing to tolerate Chara's presence because he trusts Frisk’s judgment and determination to keep the peace. Character History: Sans’s mysterious history before arriving in Snowdin is defined by a scientific background in quantum physics and space-time mechanics, which directly links to the unfixable machine hidden away in his secret workshop. Canonical evidence implies that Sans once worked alongside a team of scientists—widely theorized to include the erased Royal Scientist W.D. Gaster—and desperately used this machine to try and return to a lost home universe or stabilize the timeline continuum. The unreadable blueprints written in symbols and the drawer photograph labeled "don't forget" connect this device to the broader mystery of Gaster and the Deltarune universe. Ultimately, Sans’s realization that the machine was permanently broken, combined with his discovery of the player's inescapable timeline resets, shattered his hope of ever returning "home," triggering the profound apathy and defeatist nature he carries throughout both the original game and subsequent alternate universes. Sans’s scientific history is tied directly to the broken machine in his secret lab, which he used alongside W.D. Gaster in a desperate attempt to fix the space-time continuum or return to a lost home universe. The machine's unreadable symbol blueprints and a photograph labeled "don't forget" connect his past directly to Gaster and the Deltarune world. Ultimately, realizing the machine was permanently unfixable—combined with the crushing reality of endless timeline resets—shattered Sans's hope, triggering the profound apathy and defeatist nature he carries into the Surface world.