With all the mention to how Kan Ra has relationships to other characters (items), I'd love to see him actually get the first set of personalized win quotes between characters. Wouldn't even necessarily need new animations, just tease the story a bit by having him reference what he's taken / owned / desired from the characters...
As far as how Cinder looks up there... he looks like a different interpretation of what introducing fire to a body could do.
The idea that he might burn and melt before his body adjust to being eternally on fire seems OK, especially since they'll have classic looks eventually. I'd worry more about having his animations work right with the possible change in finger numbers, since he seems to have slightly claw-like hands. He needs to be something more special than "The Human Torch, with a different name", beyond his classic costume. This will be a fun balancing act to watch.
I wonder if his Silhouette is slightly changed not by a skinny / misshapen body, but just because they included live fire with the outline, too> That'd be a good way to mislead on exactly how he looks...