Rhya falls into the category of more enigmatic characters of the Black Clover show. He is a member of the Eye of the Midnight Sun, a group that’s a major player early in the story. Black Clover makes it clear upon Rhya’s debut that he’s not simply the typical bad guy. He’s strong, but what’s more, he has an intense past. And in true Black Clover fashion, it is very deeply connected to the world’s history.
He is known as the Rhya the Disloyal. Rhya makes his debut in episode 35 of the anime. He presents himself as someone who doesn't really care about anything. He complains a lot, is laid back, and is lazy. However, that is all we can see on the outside. Black Clover shows that behind this lazy attitude, Rhya is actually sharp and emotional. He just hides it well.

Rhya is particularly dangerous because of his magic. He can mimic other people's spells because he uses Imitation Magic. If he has enough mana and has touched someone else's grimoire, he can use it himself.
Because you can never predict what kind of magic he will use next, he is extremely difficult to defeat. The only limit to his copy is Anti-Magic, which belongs to Asta. In the world of Black Clover, where most people have one affinity, he exists on a technicality.
In the Eye of the Midnight Sun Encounter arc, he and his fellow Third Eye members fought against captains of the magic knight squads like Yami Sukehiro, Jack the Ripper, Nozel Silva, and Charlotte Roselei. He resurfaces later on in the Elf Reincarnation Arc. He fought Mereoleona Vermillion one-on-one.
Rhya is part of the Eye of the Midnight Sun. They are a group dedicated to the downfall of the Clover Kingdom. It was headed by Patri and had three people directly under him, called the Third Eye. They included Vetto, Fana, and Rhya. The three of them were elves who lived in the time of Licht and Lumiere. They were all filled with hate towards humans when the massacre happened.
Rhya is one of the elves who was betrayed by humans in the past. During the Elf Reincarnation arc, Black Clover delves deeply into this past. He was good friends with Licht, the Elves' leader, and was very hurt by that betrayal. Rhya achieves full power after being fully revived through reincarnation.

Despite being angry and ready for revenge, Rhya still has moments where his true self comes out. When he wanted to kill himself and Asta stopped him, he was reminded of Licht, but he feels that it is too late now. Technically speaking, all the reincarnated elves were villains and were also not villains. They were manipulated for a very long time. What they believed happened all those years ago was wrong, and that was the case with Rhya.
Zagred’s part in Black Clover
But when Zagred showed himself in the body of Ronne, another elf, Rhya and other elves started to change. The kindness of people like Mimosa and Asta made them see that humans were not completely terrible. Later, the revelation came out that it was Zagred who manipulated events since the time of the first Wizard King, Lumiere. He was the one who started the hate between the elves and humans long before Black Clover's main story.

When Rhya finally grasps that there was a betrayal, it rattles him. He learns that things weren’t so straightforward after all. Instead, he cooperates with other elves to take down actual threats, such as the devils who went after both humans and elves. Black Clover is great at demonstrating the growth that Rhya and his people undergo. He turns from a bitter enemy to someone who fights for peace.
Rhya’s significance goes beyond magic and strength. He reflects the power of agony to drive people in the wrong direction. However, he also demonstrates that change is always possible. Fans are further reminded by his recovery story that even the most terrible wounds can be healed by truth and knowledge. Black Clover doesn’t frame him as some ordinary villain. He’s more than that, and his journey offers a lot of emotional weight.
Conclusion
And ultimately, Rhya is one of the deeper characters in the series. He is an enemy, to begin with, but as the truth unfolds, we see the pain behind his acts. He is strong, has a warm heart, and has a desire to make things better. Black Clover uses Rhya’s past to remind us that what people experience molds them. But they can always choose a different path.