Overworld: Marco

Finally, the last important character in the cast, Marco Nunn. Despite his utilitarian approach to clothes, which makes people mistake him for a simple worker, he's the second-in-charge at the magic school which is headed by Grace - in fact, those two have known each other since they were children, and their relationship is really complicated at any given point of time. He's soft-spoken and mild, but able to do much more than anyone would ever expect of him when he feels the need to, and he also harbors some secrets that nobody should ever find out.

Other designs are here:
Kaffka Jensen
Moira Burke
Yoa
Seth Mitchell
Grace Corton
Twonks
Sileni