Board Thread:General Discussion/@comment-27907368-20160323193924/@comment-28387201-20160605151107

Brainifyer wrote: I noticed how GAster can either have pupils or not, like Sans. I headcanon his pupils disappearing when he's serious/under stress.

I also think he's Sans' and Papyrus' older brother. i think his their father, as he was before alphys as a royal scientist if you look through the game code