Fu

Like a baby in the Taiwanese guidebook, Fu was a small demon with purple skin, red eyes with black pupils, black eyeliner around his eyes, and pointed ears. He wore a yellow Dark Empire hat, a purple bib, and purple diapers.

During his youth, Fu's hair grew thick and abundant, curling outwards from the bottom. Two large bangs fall from his forehead, while a smaller one stands upright. He wears a dark yellowish-green jacket, black shorts, and yellow boots.

As a young adult, first seen in Xenoverse 2, his musculature becomes more defined. He wears a sleeveless black uniform with the yellow "IXI" symbol on each shoulder, gathered with a belt at his hips, black gloves with yellow embellishments, mustard-colored pants, and white boots. In addition, the eccentric scientist begins wearing round glasses, and his white hair is styled in a "chonmage" and tied back in a ponytail.

In the Universal Genesis Arc of Super Dragon Ball Heroes, his appearance changes slightly: he lets his hair down, wears rectangular yellow glasses, and dons a black coat over his previous uniform. Later in the same arc, after being fused with the Dark Factor by his mother Towa, Fu adopts the physical traits and characteristics of the Dark King of the Dark Demon Realm.

Unable to express himself or act on his own as a young man, Mira seems to have a substantial influence on him[3].

As a teenager, Fu is a mischievous and chaotically benevolent young man, with science being one of his greatest passions, to the point where he gets excited about gathering energy for his research. Unlike his uncle, Fu feels no familial ties to his biological parents, and therefore feels no need to avenge their deaths. Thus, Fu had no qualms about turning Darbra to stone and "betraying" him, feeling that he wants to use the energy he gathered for good.

Despite his positive traits, Fu is capable of carrying out highly dangerous and questionable acts, such as illegally altering history in defiance of Chronoa and the Time Patrol's authority, creating the Prison Planet (which would lead to the release of the League for the Eradication of the Kings of All simply for his own gain), or turning Coola Xeno into a loyal puppet. Furthermore, his research tends to involve countless innocent lives in the timelines he investigates or alters simply to satisfy his scientific curiosity, which reaches massive extremes when he ends up endangering all universes in order to create a new space-time.

When his research begins to be endangered or interfered with, the eccentric scientist abandons his playful personality and adopts a much more serious and irate tone, such as when Son Goku Xeno and Vegeta Xeno destroyed his laboratory or when Beerus wished for the destruction of the Cosmic Tree.

Fu is an expert swordsman, using his katana for the vast majority of his basic physical attacks, but he is also highly skilled in long-range techniques. Furthermore, Fu possesses the ability to manipulate and control Time Rifts, allowing him to summon powerful warriors from other timelines and control them to gather more energy. Among his other abilities are Resurrection, which he uses to revive people like Videl, and the ability to produce Blutz Waves, which he uses to transform a Saiyan into a Super Saiyan 4, as he does with Goku in the Divine Ki Dimension. He can also use magical illusions to appear as another person.

Fu (フュー, Fyū?) is a demon scientist, sorcerer, and enemy of the Time Patrol. He is the artificial son of Towa and Mira, created using the genetic information of various warriors throughout history, and the nephew of the Demon Realm's king, Darbra (Dabura), who considered him the most suitable successor to hold the position of king of the Dark Demon Realm. Thanks to his mother, Fu temporarily became the new Dark King.

He first appears as the main character of the Infinite History Arc in the video game Dragon Ball Xenoverse 2, and later as a main antagonist in Super Dragon Ball Heroes: Universe Mission and Super Dragon Ball Heroes: Big Bang Mission. However, he was previously featured in a Taiwanese guide for Dragon Ball Online, as his inclusion in the game was planned.