Romero is the F-Dynasty's coach, and the one who taught Raul and Julia how to beyblade. He found the twins in a travelling circus, and taught them how to incorporate the various tricks they learned (or had attempted to learn) into beyblading. He is something of a womanizer, and when he isn't giving the women that flock to him the time of day he shows an almost equal love for food of all kinds. He also seems to enjoy fishing as a recreational activity.
Romero seems to be rather calm and easygoing, and frets over very little. At one stage, he was shown snoozing while Raul and Julia were bickering, clearly unconcerned about their petty squabbling. He also seems to be a great deal more cunning than he appears, easily swaying Mr. Dickenson into allowing a tag team match between F-Dynasty and White Tiger X.
During the BEGA arc, he helped Kai Hiwatari learn to control his new heavy metal system Dranzer Blade.