Uther

Uther is a human-turned-Kirby who was Arthas' enemy until Arthas killed Xane, switching to the Undead.

The Chronicles of Uther
When Arthas shattered the big star in the city, he released the worst characters, including Uther, who was trapped in it with the others. While Arthas fought some of the characters he freed from the big star, Uther planned out his first attack.

After a few characters were killed, Uther reveals himself to Arthas, hacking the computer that handles the tournament, forcing Arthas' next opponent to be Kel'Thuzad. While they fight, Uther returns to his lab under the city.

Uther soon sees Kel'Thuzad get killed, and gets frustrated over Arthas' victory, and decides Arthas' old "friend" will fight him next, while at the same time realizing Xane, Arthas' "friend", hasn't been seen in a while.

Uther begins to fight Arthas in their first battle, but turns into a Gordo that Arthas threw to the side while insulting him. In the second round, Uther's driving into the small wall near the four-story garage. Uther laughs as Arthas hits his own Gordo trying to reach him, telling him to give up, though Arthas is quick to tell him he will never give up, then wins the second round by killing Uther as he continues to drive at the wall.

Just as Arthas is about to win the battle, Uther hacks the computer to add another round to their battle, starting round 3. Arthas wonders about Xane again, though Uther insults Xane, which angers Arthas. Although Uther paused time multiple times as Arthas approached him angrily, he tells him it's to "give him time to think about his actions". Arthas then reminds him he needs to think about his actions because he's doing the same thing that he did last round.

Uther then reminds him what he told him before he became an Orc, that paladins don't let their anger overcome them lest they become Orcs. Arthas agrees, but then lets Uther know he's not Undead before he kills Uther, winning the third round.

As Arthas is about to fight his next enemy, the computer gets hacked again by Uther, who forces Arthas' next battle to be against another Kirby named "Xane Myers", who he doesn't know is his "friend". Uther disappears for a while as Xane and Arthas fight, then comes back afterwards, hacking the system right before Arthas is about to fight Dora the Explorer, replacing that battle with one that involves Arthas and him.

Uther says he's become an Orc just before the battle begins, then eats weight, the best thing for an Orc to eat, to which Arthas replies he must have a sick mind to eat that. Uther, annoyed with Arthas' response, kills him.

Uther kills Arthas, which makes Xane angry; Xane hacks the system to make the next battle Xane VS Uther, then starts the battle raging at Uther, who calls him weak, to which he replies "I'll make you eat those words!" Uther tries to run away into the tunnels under the forest, but Xane boosts at Uther spinning, killing him while roaring.

Uther waited, watching Arthas and Xane go through the required race. Arthas won, which made Uther angry at both of them. Before Uther leaves, he tells them he will beat them the next time he sees them, which will be "soon".