Astro!Sans (short name Astro) is the child of Science!Sans and Outer!Sans. This is a fan made Sans created by NintendoNotch in which he is a young boy.
Astro is about 10. He is a fun smart person and is always curious about the world around him. However, he does have ADD (Attention Distractive Disorder) meaning he will get lost and his parents are over protective due to the fact that he has ADD.
Pomegranate!Sans (also created by NintendoNotch): His best and only friend.
Punk!Sans (by NintendoNotch): A punk person who picks on him.
OuterTale!Sans: His father.
Science!Sans: His other father.