Doctor

"Doctor" (ドクトル, Dokutoru) is a character in ''Yu-Gi-Oh! ARC-V. ''He is one of few people included within the Professor, Leo Akaba's inner circle. He has an ability to control people's heart and mind.

Appearance
The Doctor is a tall and thin old man with sunken eyes and cheeks, bags under his eyes, small green pupils, and long white hair in a style reminiscent of Rex Goodwin. He wears dark grey robes with an orange brown center that is patterned with yellow lines.

Fusion Dimension Arc
Doctor first appeared beside the Professor in the throne room when Serena reported she has captured Yuzu Hīragi. Along side the Professor from the room, Doctor was observing Ruri Kurosaki and Rin who were reunited with Kaito Tenjō and Yūgo respectively, smiling wickedly as he has controlled the two girls' minds.

Yūgo vs. Rin
As he watched Yūgo and Rin Duel each other, the Doctor asked Leo his thoughts about his Parasite Monsters being able to program their hosts into being loyal to him. As Leo praised his skill but warned him about losing those girls, Doctor told him that they must have ways to defend themselves due to their value. He also told him not to worry as his Parasite Monsters are perfect. He laughs as he hear Yūgo trying to make Rin remember and commented the Rin he knew is gone due her fighting for Academia by choice. He wondered what could Yūgo do after being pushed back so far and said that his Parasite Monsters are more stubborn than him. When Rin defeated Yūgo, he congratulated her and called her back as the Professor is waiting for her.undefined

Ruri vs. Shun
Doctor watched Shun and Kaito argue about Ruri's sanity and he wondered if the siblings' bond could break the Professor's will, while drawing "Parasite Fusioner" again. He was proud that his Parasite Monster seemed to control Ruri even through her bond with her sibling, but he was pleasantly surprised when Shun defeated Ruri. He found the resulting data interesting and he left to make room for improvements on his Parasite Monsters.undefined

Yūya and Yūto vs. Ruri and Serena
He was later seen watching Ruri on a screen, with Serena. Doctor laughed, and stated he was glad he placed a Parasite monster into a Academia student. He then proceeded to call Serena a "Queen" and that the "insects are drawn" towards her. At some point he placed a Parasite Monster into Yuzu, brainwashing her. He watched Ruri look for Kaito, wondering should he proceed or not while laughing. When Yūya and Ruri were going to help Shun, Doctor thought it was time for her to serve him and drew "Parasite Fusioner" again. When Shun arrived during Yūya and Ruri's Duel, Doctor saw him as annoying disturbance and looked at Serena, making her go deal with it. He laughed when Serena tased Shun and joined the Duel, saying its time for Yūya to meet his maker. When Serena Fusion Summoned "Parasite Queen", he called it a success and that his genius created the ultimate parasite monster, telling them to rampage to their heart's content. When Yūya and Yūto said they were going to defeat Doctor and save the girls, he dared them too if they defeat Ruri and Serena while laughing.undefined

Abilities
The Doctor has the ability to create Parasite Monsters, which he can implant on others.undefinedAccording to Sora, this gives him the ability to alter their hearts and minds, causing them to act as he wants them to.