Mark Chang

Mark Chang is the Prince of Yugopotamia and a close friend of Timmy's. Mark is an alien Prince from the planet Yugopotamia, a place where everyone behaves and likes things opposite of humans: For instance, they find garbage and manure to be a delicacy, and are terrified of cute things such as Poof or The Gigglepies. Mark's parents, King Gripullon and Queen Jipjorrulac, love their son very much, although they still arranged a marriage to the terrifying and beautiful (ugly to Mark) Princess Mandie. Eventually Mark fled to Earth where he uses his Fake-i-fier to remain disguised as a Human boy. Mark is greatly in love with Vicky.

In his human form, Mark appears as a boy around Timmy's age with red eyes, curly black hair, and a green hat and pink shirt with the same symbol alien-Mark has on his chest. If something nice happens to Mark, for instance getting kissed by a girl, his fake-i-fier will malfunction and he will lose the ability to remain in human form.

Ultima role
Mark appeared as he search for Timmy's help to save his family, instead, he found the Ultima through the space journey, he also join force with other Society in epic battle against Solaris.