Nicknames:

Terror
Gamma
Frightening Defender

Date of Birth: Unknown

Place of Birth: Underground

Species: Skeleton
Gender: Male
Height: 5'4

You should have ran to me when you first had the chance.-Gamma!Sans

Gamma!Sans is a version of Classic Sans that has absorbed the Terror Soul, and in doing so, he has become one of the most dangerous Sanses of all time, as well as one of the most ruthless ones to ever exist. Despite this, he is one of the most effective protectors of the Multiverse.

Backstory:

Gamma!Sans is an alternate timeline version of Sans, and the Alphaverse's answer to Ultratale's Delta!Sans, who has absorbed the Soul of Bravery. Gamma!Sans resides in an Alternate Timeline named Hypertale, and this alternate timeline follows the exact same route as Delta!Sans' Ultratale, which follows the exact same plot as Undertale. Like the 2 Universes, both Alternate Universe and original Universe, Hypertale takes place in a Genocide Run, but not by Frisk and their own choices. In fact, it is it by Chara of their own choice either. Instead, it is by an entity of unknown evil, that has taken over the both of them, and is using their body for its goals. Sans, in Hypertale, tries to fight the human, but the Human proved too strong for Sans to beat, and he is nearly killed. But than, he remembers something. During his time in Snowdin, while watching Papyrus getting killed, he remembered seeing a soul resembling Patience, but with an Aura of Terror. Thinking quickly, Sans took out a container that holds the Terror Soul, and absorbed it, in order to become Gamma!Sans, and fueled by the encouragement of the ghost of his friends to fight off the Soul's corrupting influence, Gamma and the Human fought, with Frisk even betting Sans to kill them, and Gamma kills Frisk, so that they do not cause anymore harm. With Frisk gone, and everyone else gone, Gamma decides to travel throughout the Multiverse, in order to protect them.

Appearance:

Gamma!Sans wears a white sweater with a black upside down Cyan-Colored V going across to the torso, black trousers, and black shoes. He has black liquid coming from his eyes stopping at the end of his chin. When not fighting or fighting, Gamma!Sans has white eyes, similar to the original Sans, but whenever he's serious in fights, his eyes turn into glowing cyan color, much lighter than the usual cyan eyes that Classic!Sans has. He has a floating heart that is if a bright cyan color and the upside down monster soul. In his hands is a scythe that is of a light cyan color, has a heart on each side of the flat blade parts, as Gamma holds it in his hands.

His his soul form, Ganma!Sans's entire body is covered in a glowing cyan color, with the exception of his eye sockets, nose and mouth, as they are white and has a visible white outline. The black liquid coming out of his eye sockets also disappear.

Personality:

Gamma!Sans is much more serious compared to Delta. Although Gamma!Sans can still jokes around, the jokes are rather cruel to the opponent, and he is shown to possess a terrifying cruelty within his mind. Of course, he is Cocky, but not in a genuine way. The reason he acts cocky is so that he can make a lesson think that he is simply being arrogant and is actually weaker than him, only for them to realize too late that he is a lot stronger than them. Also, he is not that emotional compared to Delta, but he still has some bit of it when he is involved in talking about Chara or Frisk, just in a much more subdued manner than Delta whenever he gets emotional.

Gamma!Sans loves to torture people and cause misery to those that are his enemies, and he will make sure that their experience to him will be the worst one that they have yet. He'll even use his powers in order to aid in the torture of making sure that his opponent suffers very deeply. However, despite his cruelty, he takes his duty of protecting the AUs very seriously, and is even friendly to other AUs whenever he has a chance to speak to them.

Powers:

AU Hopping: Gamma Sans can traverse through other AUs, and he is much more better at using it than Delta.

Gamma Blasters: Gamma!Sans' Blasters have an identical appearance when compared to the original blasters, but its appearance and charge are what make it different. These Delta Blasters have a white body but light cyan jaws. Both of their eyes are replaced with Gamma Sans's serious eyes. They also have a set of black "teeth" on both the upper and lower jaw, but in some cases do not have these set of teeth. Their blasts are cyan as well.

Mouth Laser: Like Delta!Sans, Gamma!Sans fires a laser blast from his mouth. It is the same as a normal Gamma Blaster, but faster and stronger, and unlike Delta's Mouth Laser, his has a much more wider and more longer range, in comparison where Delta had to exchange power and speed with the range, making it fire with a shorter range.

Gamma Jet: Gamma!Sans equips a blaster on his back that boosts his speed greatly and lets him fly. The jet is breakable and Gamma!Sans will fall down if it's destroyed in mid-air. However, it is much more durable compared to Delta's version of it, and is much more faster as well, which will be difficult for those that are trying to shoot Gamma!Sans down from the sky

Gamma Scythe: This scythe is formed from using the magic of the Terror Soul. The Gamma Scythe is so strong that it can cut and tear apart the minds of any man, monster or abomination. The Blade is nigh-indestructible and can slice, kill and destroy just about anything, and with the heart-shaped hole on the blade, is able to trap a person's blade with it. The Gamma Scythe is as strong as the Terror Scythe that is owned by Alpha!Betty herself.

Gamma Slice: Gamma can swing his scythe in order to cause massive damage to the opponent. The slide of the scythe is so powerful that even Error404 can get damaged by that attack, though it won't kill him.

Gamma Spear: Gamma!Sans is able to turn the blade of the scythe into the point of a spear. Through the use of the Gamma Spear, Gamma!Sans is able to pierce her enemies, usually one, but can do multiple targets at once. It also has a string attacked to the bottom handle of the spear, so that Gamma!Sans is able to retrieve it, should it be too far away for him to pick it up by himself, as well as being a faster way to bring it back to him.

Gamma Stab: Gamma is able to pierce the opponents with the spear, causing more damage than the scythe.

Staggering Trick: Gamma is able to make a cover of smoke but striking the ground with his scythe, concealing himself with dust and summons 4 Gamma Blasters that will automatically target-lock the enemy.

High-Hypersonic Speed: Gamma is so fast that he looks like he is a blur of some kind, and he is too fast for the naked eye to see. He'll even be invisible. However, despite this, he is slow behind Omnipotent's speed and Error404's speed, but evenly matches Alpha!Betty's.

Illusion Casting: Gamma!Sans is able to cast illusions onto an opponent. He can do this upon multiple people at a time. The target who has been placed under said illusion is seemingly unable to discern reality, nor break free from the illusion on their own unless done by Gamma!Sans himself. He can use this at a advantage for extra help on the battle field, similarly as if he was mind controlling someone, and can even use this as a way to mentally torture someone with illusions of people they love, or their worst phobias.

Memory Access: Terror is able to invade and access the memories of others by simply being in their presence.

Soul Draining: Gamma is able to use his powers in order to drain the souls of other entities, usually as a way to replenish the magic that he had lost when he feels rather exhausted. It is also used to make himself more stronger.

Gamma Blast: Gamma!Sans can summon dark cobalt triangular projectiles, or cyan colored slashes to launch at her opponents. They are also known to explode upon impact with whatever it is targeting, due to Terror being an upgraded form of Fear, with Fear being the negative inversion of Bravery, which is known for explosive magic.

Gamma Terror: Due to Gamma!Sans being able to fuse his soul with the strongest Terror Soul, he is able to make his presence so terrifying that many normal monsters are very afraid and would avoid him. The Gamma Terror is as strong as the Intense Terror of Alpha!Betty.

Multiversophobia: Gamma's version of Rhapdophobia, Gamma is able to create a dome of negative energy, as well as any nearby incoming attacks, which allows for him to take it. When he does take it, he not only controls these attacks, but he also has the power to amplify them, thus making their attacks much more devastating and damaging them ever before. The only downside to this, is that Gamma has to use up a lot of magic in order to use this power, with the upside being that it does not require a cooldown.

Transformations:

SOUL FORM/TERROR FORM: The Soul Form, also known as the Terror Form is a transformation that Gamma!Sans is able to activate whenever he is close to defeat. This form can unleash devastating attacks that would turn the tide of battle, and Gamma!Sans' attacks will be amplified much more than ever before.

Strike of Terror: Gamma coats his scythe in mist to increase the Scythe's speed and sharpness. The slice is so powerful that it even surpasses Alpha!Frisk's Katana.

Submission: Gamma is able to raise his scythe into the air, and when he charges his attack, he strikes the ground, creating a blinding explosion that can unleash a magic energy that not only is able to take control of an opponent or more,  it it is also able to amplify the attacks of the entity that he is controlling much more stronger than ever before. This is used whenever there are enemies with useful capabilities nearby, but it has a limited range, so he can only use this when he is in range of the entity that he wants to take over.

Relationships:

Brimm!Epic: A friend and a rival of Gamma!Sans, both Epic and Gamma get along with each other, and even had a few sparring matching against each other. Gamma is even flabbergasted that a single rubber chicken is able to against a scythe as powerful as Gamma's, but he does not complain, knowing that it won't change anything.

Limbo: Gamma and Limbo are very friendly to each other, with Gamma even having a type of rivalry with Limbo, due to how he is somehow able to adapt to the power of the Terror Soul, even though it shouldn't be possible to be this way. But regardless of how he is confused at how he can do this, Gamma and Limbo are very reliable teammates to each other.

Error: The Destroyer of AUs once controlled Gamma once, and Gamma returned the favor by using his own monster controlling powers on him to make him attack Error404. Needless to say, Error and Gamma have a strong sense of rivalry against each other.

Error404: Due to Gamma's powers, Error404 tried to use his mind manipulation to force Gamma to be with him, only for Gamma to turn this around with his illusions. Needless to say, Error404 once revenge against Gamma for what he had done to him, as his illusions showed Chara.

Ink: Ink and Gamma had fought once, due to Ink attempting to consume him. He almost lost, if Error had not came at the right time to pick a fight with Ink. Nowadays, he tries to avoid the corrupted protector.

Delta: The counterpart of Gamma from the original Undertale Multiverse. The both of them get along surprisingly well, even though Gamma uses a Terror Soul. Regardless, they work together as an effective unit.

Archangel: An Alphatale version of Seraphim, as well as the one that absorbed all of the human souls, in addition to the Conduit Soul of Healing, both Gamma and Archangel get along well.

Betty: The experiment of the Defiled Witch, Gamma and Betty have a form of bitter rivalry to each other, due to the fact that Betty hates skeletons, and the fact that Gamma has a Terror Soul makes it worse for Betty to hate Gamma even more so.

CORE: Core!Frisk and Gamma are very cordial to each other, and Gamma is even allowed to visit the Omega Timeline. Because of this, Gamma would go there to defend it from anyone that dares to try and attack it.

Notes:

Gamma and Betty hate each other so much that they will do whatever it takes to make sure the other suffers.

Gamma can use his Illusion Casting in order to prank people, such as making them see something scary. Despite this, he can still give someone a whopper cushion in the hand.

Gamma's ability to access memories, combined with his intelligence, is able to act as an informer to CORE, in order to discover what it is that is happening and what the enemy is doing, in order to think of a plan in order to deal with them.