WD Gastthew

"🕈︎☟︎✌︎❄︎🕯︎💧︎ 🕆︎🏱︎✍︎" (WHAT'S UP?) - Gastthew to Lusk

Gastthew was the Royal Scientist before Alya and the UnderEK version of Gaster: http://undertale.wikia.com/wiki/W._D._Gaster

He created the core and performed many determination experiments, one causing him to go temporarily missing. He is referred to by the River Lady and the Gastthew Followers.

Species/Appearance
Gastthew is a skeleton with neat, black hair and a cracked face. He is wearing a grey sweater, a black suit and grey pants. He also has holes in his hands, carved by a determination experiment.

Personality
Gastthew is a mysterious character and not much is known about him. But he is persistent and determined, likely because he injected determination into himself. Strangely, Gastthew isn't an almagamate.

Abilities
Gastthew summons Gastthew Blastthews, like Sansronu does, which are strange creatures that fire lasers. He also slams "hands" at Lusk's soul. The hands resemble his own, since they have holes in them. As the battle progresses, the hands get larger and larger, until the only way to dodge them is to go into the hole.

Backstory
WD Gastthew was Asgore's Royal Scientist, before Alya. He extracted determination, experimenting with different items. In one experiment, he accidentally created Sansronu and Justayus from his own DNA. He took the baby skeletons under his care for many years. He decided to make them a sister, Skia. Dangerous determination experimentation caused him to go mad. He decided to make Skia powerful enough to kill his sons. (Wow, that's  EVIL!!! ) Skia refused to fight them. Gastthew, blinded with anger, attempted to kill them all. Even the three of them couldn't stop him. They went separate ways. They agreed to rendezvous at Snowdin. However, Skia mistook Snowdin for Hotland. She was cornered by Gastthew, forcing her to jump into lava, becoming a ghost. Gastthew started a hidden lab in Waterfall where he plotted the destruction of his children. During Lusk's fight with Skia in the Pacifist Route, Gastthew interrupts them and takes control of Skia. Lusk can kill Gastthew and abort the Pacifist Route or he can spare them by restoring their memories. Gastthew realises what he did to his children and collapses to the floor in tears. He releases control of Skia and Lusk can continue. At the end of the Route, Gastthew apologises to Skia, Sansronu and Justayus and finds Skia a human body to live in. They live together in a house on the surface.