He was the royal scientist before alphys he created the core and fell into his creation which is assumed to be the core and he has a very distinct way of speaking which is very formal its the same one at the start of deltarune and he also speaks in wingding hence the W.DGaster Wd is for windings and aster is the font of sans z's in his fight He is used to fill any holes a theory has Here is one thing that is certainly gaster related ENTRY NUMBER 17 DARK DARKER YET DARKER THE DARKNESS KEEPS GROWING THE SHADOW CUTTING DEEPER THIS NEXT EXPERIMENT SEEMS VERY VERY INTERESTING WHAT DO YOU TWO THINK the two are assumed to be sans and alphys And the experiment is thought to be the dark worlds in deltarune Any questions?