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Character:

Death the Kid , commonly referred to as "Kid", is Shinigami's son and the meister of Liz and Patti. He suffers from obsessive-compulsive disorder, which hinders him in his daily life and battles. He believes anything symmetrical is beautiful and if something is off by even the slightest measurement, he will try to correct it right away. He spends hours on a single task, such as arranging his house or filing Liz's nails. He constantly worries that something is slightly off, and he will go all the way back to check, even during missions. He becomes depressed and sickly if something is too asymmetrical, and he becomes obsessed with anything he finds to be perfectly symmetrical. 

Source from Wikipeida