Science Sans

Science Sans was probably investigating AU (multiverse), they were investigating you, then a portal appeared, you entered and they took you to Snowland . You have to decide whether to forgive or kill, or if you want to join Sans and Alphys as scientists. (This Sans's story is indicated.)

A Sans different from the classic one, known as "Science Sans," left behind his laziness and constant jokes to dedicate himself entirely to science alongside Alphys. Fascinated by the mysteries of determination and anomalies between timelines, he began working on experiments related to alternate universes, studying strange phenomena from corrupted and distorted AUs like [insert AU name here]. Unlike the original Sans, this one doesn't spend his time sleeping or avoiding responsibilities; he spends long hours in the lab analyzing data, observing temporal fractures, and trying to understand how certain anomalies can alter the entire reality.

Science Sans has a rather distinct appearance. He wears special scientific goggles capable of scanning energy, detecting dimensional disturbances, and even analyzing determination levels in other beings. Over his clothing, he wears a dark blue lab coat, and in several instances, he carries vials filled with strange liquids, some containing pure determination and others experimental compounds created by him and Alphys. Many of these vials glow with intense colors, indicating their dangerous and unstable nature. He also frequently carries small technological devices, analytical tools, and holographic displays designed to monitor dimensional anomalies.

Although he retains some of Sans's laid-back humor, this Sans isn't entirely an AU, because he's from the same Undertale universe. He's not from a completely different reality like Horrortale or other AUs. Science Sans can understand Determination, how he can reset that dimension, or even prevent death. This Sans is self-aware, having experienced this more than once. He also has more sophisticated control over his attacks. Gasterblaster adapted for durable and many types of environments Longer-lasting bones Tablets capable of sending reinforcements Vials of poison capable of carrying more things etc.