My first leap onto the bandwagon was with a character I have named Achlys.

They're not very nice.. Hahah.
In fact they're quite cynical, negative, and unpleasant most of the time. This is the gem featured in the pic here: http://www.furaffinity.net/view/16380045/

Achlys

Gender: Agender

Pronouns: They/Them/Their

Sexual Orientation: (Attracted to women/femininity)

Height: 6’2”

Weapon: Gem spawns innumerable amounts of labradorite arms from any surface they concentrate on.

Gem Type: Labradorite

Likes: Shadowy places, hot babes, gemstone monsters, making others miserable or uncomfortable, easily intimidated characters

Dislikes: Brightness, incompetence, obnoxious characters, sensitive individuals… Musical numbers.

Hobbies: Not much is known about how they spend their time. They tend to pop up at random to harass unfortunate victims. Is that considered a hobby?

Talents/Skills: Being unpleasant. They are exceptionally talented at shapeshifting and are skilled at offering defense and offensive support for other gems using their ability/weapon. Mild psychic vision

Personality: They prefer to remain aloof unless explicitly bored or in a situation that invites them to make a critical observation of another’s feelings, personality, or flum-up— aka share their ‘wisdom’. While they can be quite nasty, it’s possible to penetrate their ghastly personality by taking an overt interest in them and being kind for no specific reason. They might be suspicious of you..but will eventually become loyal and fiercely defensive on a friend’s behalf.