He's Has seen some of the universes after peeking and never wants to see them again.

---///---

Seeing this makes me assume they didn’t get too much farther into the project…

But its almost like the machine refuses to be fixed...

He's been trying for so long now... he hopes that he will succeed soon... He misses his dad. ---///---

Before this happened, Gaster pushed his oldest son out way, saving him, but not enough, for he was knocked back and he was caught in the blast. This would then give him the ability to remember Gaster and the RESETS. 

Sans of course worked hard as the Years went buy, took his younger brother, Moved to Snowdin, and continued to work on the machine, but it refused to work.... until the barrier broke and they all moved & settled on the surface... 

Ebbot city wasnt big nor was it small, but after half a year of talking, the deeds to the forests and land around the mountain, and the mountain itself (And Ebbot Town) was granted to the Monsters, And Ebott City was names the Monster capital.

There were still those who decided to stay living in the mountain, while there were also those who wanted to only live in the City that was being newly built at the Base of Mt. Ebbot...

Sans started to once again work as a scientist, being one of only two people who understood the CORE. But in his spare time he continued on the machine - One day... it just started to finally work, Freeing Gaster and returning his existence and memory to the world. He was given his original position, freeing up Alphis and letting her have more free time with Undyne and other friends.

In Depth Headcanon Prompts:

✖ : Describe a way to make them uneasy or apprehensive.

Gaster himself is rather difficult to threaten since he doesn’t generally pay much attention to his own well-being. He is mostly concerned about the good of others, and protecting others, since his pride and anxiety keeps him from worrying too much about himself.

It’s pretty easy to make Gaster nervous or uncomfortable with intimacy or displays of emotion since he prefers to be a bit of a loner. He will sometimes react well to this, but usually the encounters catch him off guard.

Common fears he has include a slight fear of the dark, an intense fear of failure and shame. Gaster strongly dislikes public speaking, actually, and would be completely consumed by anxiety if he felt he was in a position where he was responsible for someone else’s actions, or could not control his own actions. He resists change with every ounce of his being.