Ulti

Ulti is a young woman of relatively tall height, with a light complexion. Her hair reaches near her mid-back and forms rounded locks mainly blue in coloration, but with thin, pink-colored streaks running through (plus a single white one over her left eye). Blunt bangs fall on her forehead, split near the left, and an ahoge stands up on her head. Characteristically (as with many of her crewmates), Ulti has horns: a sharp, upward-curving pair emerging from the sides of her head, white in color, that resemble a bull's. Ulti's eyes are large, round, fringed by long lashes, and encompass violet irises. Her lower face up to the nose is covered by a pink mask with a scalloped edge, trimmed with a white stripe; Ulti keeps this mask even when she assumes her pachycephalosaurus form. When in her Human-Beast Form, Ulti's bangs are pushed back, exposing her forehead. Otherwise, Ulti takes to wearing a long-sleeved minidress that is white and pleated above the waist, with a blue bow below a point collar. The dress's lower, light-blue, and non-pleated section, with a button placket in the middle, ends in a short skirt part that has a slightly ruffled hem, leaving most of Ulti's legs visible. Fastened on her shoulders is a darker-blue cape trimmed with light-blue fur on its edges (the inside also blue), which goes near the ground, and her footwear are red high heels.

Ulti is merciless towards enemies and willing to brutalize them without hesitation. She is also not above hitting a child if annoyed, as seen when she clawed at Tama for begging her to stop hurting her friend. In battle, due to her aggressive nature, Ulti is quick to attack anyone she deems an enemy. Still, she remains a quick decision-maker and keeps her guard up continuously, as shown when she set upon and seemingly crushed Monkey D. Luffy in their first clash. Rather than gloat and let down her guard like the grunts around her, Ulti instead kept track of him using Haki, quickly transforming and readying for further combat upon sensing Luffy's own Haki. Ulti has a somewhat vengeful streak. She tends to grow extremely angry over, and swear to get payback for, enemies hurting her or her brother, Page One, even when the responsible party is much stronger than Ulti, like the Emperor Big Mom. Despite her childish bearing, Ulti can be smarter than she lets on. In the past, she managed to steal two Devil Fruits from Kaidou to give to herself and her brother, thus giving them the strength necessary for them to survive in the crew and ultimately rise through its ranks.

In her speech, Ulti follows certain "trends" to come across as fancy. Since her debut, she has taken to ending her sentences (sometimes incorrectly) with arinsu—an archaic, polite copula and variant of arimasu that means "to be" and is associated with courtesans/oiran—as well as the first-person pronoun achiki, likewise associated with courtesans. According to Page One, said verbal habits (which become a generally sophisticated register in the Viz translation) are an attempt of Ulti's to sound like a fancy lady. When she snaps due to being annoyed, however, Ulti slips into a vulgar and bratty tone and uses the more neutral pronoun "watashi", showing how superficial the woman's mature manner of talking is. Overall, Ulti has had many different ways of ending her sentences that changed over time.

Page One is Ulti's younger brother, two years younger than her, and refers to her as "elder sister". Ulti is extremely protective of Page One, whom to his annoyance she calls "Pay-tan" (VIZ: "Pay-Pay") to be endearing, "-tan" being a more diminutive version of the name suffix "-chan" (usually used by and to address children in a "cute", affectionate manner). However, this does not fully safeguard Page One from the same hostility Ulti extends to the rest of their crew. While speaking kindly to him when unagitated, her treatment of Page One is rather volatile, ranging from supportive to demanding, to abrasive and outright violent, usually escalating the more he tries to rebuff her. Overall, Ulti seems more overtly attached to Page One than the other way around, much to his annoyance. She chased him during their search for Yamato, even latching onto and forcing him to give her a piggyback ride. Whenever the chance arises, Ulti seeks sympathy from Page One, like when she gets hit by an attack that does not actually hurt her, though Page One tends to ignore or reject her attention-seeking. He does worry about her though, if she does sustain potentially serious harm, and Ulti likewise gets extremely angry if someone hurts her brother.