On the surface, Edward displays an immature sort of personality. He is decidedly stubborn and strong-willed, frequently letting his pettiness and vindictiveness get the better of him (it is this stubbornness that contributes to Führer Bradley's decision to codename him "Fullmetal," as "Hagane" (literally meaning "steel") is a term in Japanese that denotes someone of obstinate disposition.) and often has to be restrained or reprimanded by Al or whoever else is present.