Obsidian (Indominus Rex 2016)

Appearance
Her hair seems to be like Opal's but Purple and with black stripes and four arms, four eyes and seens a little to complex

History
Obsidian was a member of the Yellow Diamond court, she helped creating Raptor and went to Earth beacuse she was woried Raptor woud'int survive in Earth but Raptor was alredy in the Cristal Gems but wen the Gems were going to attack her Raptor recognized her and defended her, so the Gems told her all that Home World was doing to Earth so she joined the rebelion and now she helps Raptor defend Earth.

Abilities
Obisidian with her four hands can create four canons and even combine them to create a huge canon.
 * Canon Blaster

Personality
Obsidian is a good lisener and acts pretty nice to her friends.