Ay others? The Professor is easy. I've played through GTG about forty times by now. Each time I just sit next to him and listen to the "Ah hah!"
Yeah there are many more characters that we need concept art of.
Hunter
His head should look exactly like the head of a real cheetah. His ears will be round shaped just like a cheetahs. He Uses bow and arrow as a weapon in the prologue but uses a strange gun throughout the rest of the movie. This gun looks like a rifle and has a pick axe shaped attachment at the end of it. He uses the attachment for close combat. Near the end of the movie he wears a metallic body enhancing suit made by Elora. This suit works very much like Iron mans suit.
Elora
The professors assistant. She looks mostly like the Elora from ripto's rage. I imagine her to have an elven human head instead of a half human half dear head like she does in the game. She could be wearing a lab coat throughout the movie. She is beautiful but I want her clothing to be modest and not very reveling.
Bianca
Apprentice of queen Miko AKA the sorceress from Year of the dragon. She has a purple crystal hanging form her necklace. She uses the energy inside this crystal to enhance her fighting. She uses a kung fu type fighting style.
Marco
A gnorc hired by Elora to act as pilot of the Jetta. The Jetta is a falcon shaped aircraft invented by Elora.
Rynoc soldier
Servants of Queen Miko. They wield large swords and axes. Some even use primitive guns. these guns look allot like old pirate weapons like flintlock pistols ect.
There are more characters but I don't want to give too much away yet.