Gemini is great, they are super calm and just want everyone to be happy.
They have a habit of wearing hoods and masks to make other people more comfortable in their presence.
They have a particular fondness for sick masks and occasionally will wear long (often very colorful) wigs.
Gem loves cats, like so much. They have all the mementos in Neko Atsume and will make jokes about "memento moris" that end it them laughing to themself and muttering "get it, cuz I'm dead."

Wants people to call them "Mori", no one does.

Is an exorcist, but also a fashion student. They make a lot of their own clothes (often mimicking popular clothing they have seen). They also work part time at a Book Store. (Rarely actually does any exorcisms)

Likes cute clothes, hates gender roles.
"So are you a boy or a girl?"
"I'm dead"
"But what's in your pants?"
"Plastic"

Calls familiar Toasty, Weird Dog, 2000 Yen, Snookums, 45 Bucks, That weird animal that's long... FERRET!
It is unclear if their familiar actually has a name, its also unclear how the creature puts up with Gemini.

Animated Version: http://imgur.com/qLlJJNz