Romero has a generally slouched and unkempt appearance. Much of his visual design draws a semblance of the undead variety; desaturated bluish-gray hair which he wears messily spiked over the right of his face, no eyebrows, bug-wide eyes, nose often simplified as two dots, and overly distinctive straight teeth.
He wears the Isamu High uniform, which consists of a white dress shirt with a red tie around his neck, over which is a dark blue blazer and below is a pair of plain gray dress pants and dark brown loafers.
When he’s in his hero costume, his posture seems to straighten. He wears a black, double-breasted coat with a high collar and thick gray cuffs, which extends past his knees, with a system of wires and nozzles attached around his waist, ankles and down his arms. He has a translucent, purple-tinted mask over his mouth to protect himself from his Quirk, and wears gloves and pointed dress shoes, pinstriped pants visible above them.
He seems to constantly look down on the UA students, which causes him to clash with Katsuki Bakugo, of whom he has been said to be similar to.
Like many of the other students, he idolizes All Might.
Romero took an instant dislike of Katsuki from the moment they met. He uses his Quirk to create zombies and gets turned into one.
Zombie Virus (ゾンビ ヴィルス Zonbi Virusu?): Romero's Quirk allows him to discharge a pink gas from his body which transforms anyone who breathes it in so that they have the mental capacity and appearance of a zombie (as well as invulnerability and the ability to turn other people into zombies by biting them).
However, much like the villain Mustard, Romero is not immune to the transformative power of his gas and has to wear a breathing mask as protection.
- Romero's name is composed of "wisteria" (藤 fuji?), "looking" (見 mi?), "dew" (露 ro?), "summon" (召 me?) and "spine" (呂 ro?).