Flame Haji
Ground Gym Leader
I don't know, there looks are iconic in same ways...would be strange to change them.Whetever they're old characters or not doesn't make that much of a difference.
In any case I think that character customization will remain; I mean, this is the greatest feature that they could introduce in the Pokèmon franchise.
Don't get me wrong I want customization, I was just wondering what others thought.