Was Gaster a human?
Gaster was
a human scientist, studying the ideas of time and space. He believed that there are many universes that are connected together. He made a machine built to travle to dfferent timelines and worlds. Once he tested it, the machine broke and the poor man had his skin melted and became a skeleton.
Does Gaster have a soul?
Gaster is later shown to start researching the
pink soul of Bete as soon as he found out that she had a pink Soul.
How do I see Gaster?
3:264:30Undertale - How to find Gaster - YouTubeYouTube
What happens if you name the human human?
Nothing special happens when you name the fallen human Chara: it just tells you “
the true name.” Naming the fallen human Frisk will activate hard mode. It doesn't matter which route you take—genocide, pacifist, or neutral. Additionally, hard mode only lasts until the end of the Ruins.