Sun Jen-djieh

Doctor Sun Jen-djieh is a Sparky medical doctor and administrator of Mechanicsburg's Great Hospital; he is originally from somewhere in China.

In earlier times, he was a good friend and travelling companion of Baron Klaus Wulfenbach's, and presumably that of the Heterodyne Boys as well. Now since both are older and saddled with responsibilities, he is "merely" a good friend of the Baron's with little room for travel. This familiarity allows him to retort to Klaus's demands from his hospital bed with no fear or intimidation whatsoever, and in fact will bully him back for his own good.

From Gil's form of address to the doctor, Sun seems to have had some hand in training Gil in medical sciences, as "sifu" means "master", "teacher" or, to use the slightly more familiar Japanese term, "sensei".

The doctor runs the Great Hospital with strictness, great efficiency and excellent hygenic practices; his unorthodox experimentation usually produces beneficial results for his patients.