Markl has ginger hair and brown eyes. Markl wear a green vest and he disguised the old man wizard.
Markl is very obedient, doing what he is being told. He also gives pointers to Sophie when she first arrived, making sure to keep her out of trouble.
At first, Markl detests Sophie, thinking she was a witch and also for barging into Howl's castle. But he quickly grows to appreciate her. When Sophie's mother visits Sophie, Markl insist Sophie not to leave because everyone living in the castle is now a family to him.