Tiger’s brother, Leo, was at first a prototype for a waiter at a restaurant but as soon as Tiger’s mental state was so bad while building her, her personality needed to be split and new genes had to be put in, Alphys’s prototype was given 3 of 6 main traits, Math, Science and not believing in fantasy, all things Tiger needed to survive in the underground. Melissa, on the other hand, has a totally different story. Two years after the start of Tiger's construction, Asgore had captured 6 human souls. Bravery, Justice, Patience, Integrity, Perseverance, and Kindness.Kindness was lucky. She was chosen out of the six and secretly stolen by Alphys.
"G-Gaster! G-Gaster! I got her. but I think she's dying" Alphys rushed in with the soul, still in the glass container lined with silver and placed it down on the counter near Dr. W.D Gaster.