Their schemes almost always blow up in their faces in a spectacular fashion, like freeing King Piccolo only to have him throw them out of a moving plane. As the years went by, Goku became physically stronger, while Bulma's strength was her mind and the many brilliant inventions she produced. Xuanzang is more of a guide on the quest, and has to surround himself with warriors to protect himself.
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Due to his love for food, the short samurai is quite overweight, even bordering on the obese.