He was one of the males who was forced to be female because most of his monster kind were female... and if you are born male you...
1. Have to play a role as a female
2. Be obsessed over by girls and get annoyed with it/forced marriage...
3. If sinful will get the guillotine...

Though Gaisha!Gaster's role is a GaishaGuard... and he wears his mask 24/7...

This is his mask... it had to look feminine due to the female rule...

Gaisha!Gaster knows how to use bombs to his advantage as well due to humans...

In his world peace was created because of marriage Chara *is female in this universe* had to marry Asrial... for peace... but one human male murders both Chara and Asrial causing the war... *which has not stopped* causing women to become the upbrigers and are treated with respect... as for males there are barely any males because of the war... males didn't want women involved due to some baring children or so children are not homeless... but in Gaster's case he has both genders *though considers being called a he* causing confusion so he became a GaishaGuard the only one who had this job...

Means he kicked others a$$es while greeting them... and is quick on his feet... and knows martial arts... and origami...

He prefers to be alone like a lone wolf...

He was born in 1994... meaning his Japanese zodiac animal is a dog...

Birthdate is June 24th 1994...

Anyways see you in the next chapter my fluffy clan members