Beruzei, also known as Encastle in some adaptations, is a male antagonist from the anime Pretty Cure. His background places him as one of the Seeds of Darkness, a group of powerful beings created by the primary villain, the Evil King. He is distinguished as the leader of the three Seeds and is often considered the strongest among them. To operate within the human world, he assumes the alias of Yuuki Hidehiko, where he presents himself as the kindly and respectable director of a hospital.

In terms of personality, Beruzei displays a multifaceted nature that sets him apart from his allies. In his human guise as the doctor, he is genuinely amiable and helpful, once offering aid to injured characters by bringing them to his hospital. However, this civility masks the cunning and strategic mind of a villain. He is the primary planner among the Seeds, often devising the schemes to defeat the Pretty Cures, such as orchestrating a plan to separate Cure Black and Cure White. Unlike his comrades Regine and Juna, who can be more flamboyant or reckless, Beruzei acts with a calm and composed demeanor, though he can become noticeably irritated by the failures or antics of his fellow Seeds.

Beruzei’s primary motivation evolves over the course of the story. Initially, his goal is aligned with the Evil King’s directive to collect the Prism Stones and defeat the Pretty Cures. However, his true ambition is more rebellious and self-serving. He and the other Seeds seek to master the "power to create," which they intend to use to overcome the "power to consume" that defines the Evil King. Their ultimate aim is to break free from being mere servants and seize control of their own destiny, even if that means overthrowing their own master.

His role in the story is that of a strategic and formidable foe. He is the last of the three Seeds to awaken and appear before the Pretty Cures, making his entrance in a later episode where he immediately establishes his authority. He captures the guardian of the Prism Stones and holds it in a cage to study how to invoke the stones' power. In the final arc, he leads Juna and Regine in a ritual to fuse their bodies into a single, powerful being of pure darkness. In this fused state, his appearance changes drastically, with his hair and entire body turning black. They use this combined form to directly challenge the Evil King, but their rebellion ultimately fails, and they are defeated and absorbed by their creator.

Key relationships define his narrative arc. He acts as the superior to Regine and Juna, often becoming exasperated with their incompetence while still relying on them as his primary allies. His relationship with the Pretty Cures, Nagisa Misumi and Honoka Yukishiro, is one of direct antagonism, viewing them as obstacles to be eliminated to acquire the Prism Stones and achieve his freedom. The most critical relationship, however, is with the Evil King, his creator. This dynamic shifts from one of subservience to outright betrayal, as Beruzei seeks to usurp the king’s power for himself.

Regarding notable abilities, Beruzei is a formidable combatant. In his true form, he dons a purple spandex suit and gains distinct purple facial markings reminiscent of claws. His signature power is the manipulation of lightning, which he can summon and direct as a weapon against his enemies. As the leader, he is shown to be the strongest of the three Seeds in his transformed state. Furthermore, his most significant ability is the capacity to merge with Juna and Regine, creating a singular, more powerful entity that can challenge even the Evil King.