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Yu is known as Obel's finest doctor, and is in great demand by all the residents. He serves where he thinks he is needed the most, and for that reason boards Lazlo's ship when it is launched into the sea, to act as the army doctor for his forces.
He works with his assistant, Carrie, who served him throughout the Island Liberation War, and afterwards, when they opened up a free infirmary for all the residents of Obel. When King Lino en Kuldes is looking for Obelians to help Kyril search through Kooluk for rune cannons, he sends for both Carrie and Yu. Yu is away on a trip, so Carrie goes alone. However, she comes back for him later, and he assists the entourage by providing medical treatment in battle.
He sometimes goes the easy route when treating people, notably when it comes to Trishtan, a hypochondriac living in Obel, who believes himself to be extremely sick, and can only be cured by Dr. Yu's potent medicine. Anybody else who asks Yu will hear him attest that Trishtan is one of the healthiest people he's ever seen, and he continues to sell him flour as long as Trishtan thinks he needs it, as there's nothing Yu could do to make Trishtan believe he's not sick. - KoRnholio