Puss Moth Caterpillar - inspired Gladiator character design

Deep sea creature - inspired Gladiator character design

Scyrce - an Evlish sorceress with kleptomaniac tendencies 

The Bone Collector: Sci-fi concept where humans have long left the earth for greener pastures, leaving some of their robots to fend for themselves. Some robots slowly developed consciousness and weird quirks such as this one (he has a goal in expanding his bone collection). 

The prodigal son: Bunny prince is quite naughty. His father told him not to visit the surface and sent his advisor to bring him back to the underworld. Unfortunately, the First Men followed the bunny prince back and discovered the place.