My Gem'sona because I'm SU trash
I liked the idea of Hackmanite and what it's used for
as well as it's ability to change color(as in fading/brightening)

I wanted to make my own childish lil'shit who don't need no friends.
His gem is located on his tongue and it's 'cut' is a heart shape
and as for his role despite being a childish asshole he's a support/healer "White Mage"