Ibara

Ibara is a minister on Treasure Island. He is one of the main antagonists in Dr. Stone.

Personality
Ibara is cautious of any thing that he may perceive to be a threat on Treasure Island. He is attentive to minute details and many times is suspicious of things that he perceives to be out of place around him. Ibara is shown to be hesitant and takes his time to observe the setting he is in for minute detail. Ibara displays a lustful personality by how he takes his time selecting girls to be sent to the Great Leader. However, Ibara is known to be deceitful as he fooled many villages into thinking the Great Leader is active even though he was turned to stone. Ibara is also shown to be homicidal when anyone uncovers his secret and nearly murdered Ginro when he saw the Great Leader. Ibara displays a sadistic side when he attempts to close in on his enemies. He is also strategic when attempting to corner his enemies as he got all the people on the island onto the Perseus ship in order to light the entire island in the petrification beam to turn his enemies to stone.

Past
At some point, Ibara got into contact with the Great Leader of the Petrification Kingdom. It is unknown what occurred between him and the leader but Ibara was likely responsible for petrifying the leader. Ibara then lied about the condition of the Great leader by convincing the villagers that the Great Leader was still alive. Because of his actions, he earned the scorn of Mozu. However, Ibara took the opportunity to allow Kirisame to possess the petrification weapon. With many villagers under the belief that the Great Leader is alive, Ibara have been the one who has been in control of Treasure Island.

Plot
When Kingdom of Science's ship Perseus arrived near Treasure Island, Kirisame petrified all the inhabitants on the ship by turning them to stone. Ibara and his men appeared on the ship attempting to seize important items on the ship. Ibara was attentive to the surroundings on the ship and wandered why one of the barrels were out of place. Ibara was later surprised to see the Kingdom of Science's lab move off the ship and onto the water and into the island. Even though his men told him, that it was an animal that landed on the island, Ibara was suspicious of the being on the island.

Ibara appears antagonizing and grabbing a girl who is near him. He then leads an event where he hand-selects girls to be sent to the Great Leader. Unbeknownst to him, he picked Kohaku, Ginro, and Amaryllis who are spies. As the girls are settled in at the place where the Great Leader is at, Ibara remains suspicious that there are intruders on the island. Ibara and his men then orders his people to take the statues on the ship and smash them to pieces and throw them into the ocean. Ibara has his men take a statue of Ryusui and has the harem girls break it a part in an attempt to single out the intruders on the island. However, Kohaku destroys the statue in an attempt to take attention off of her being the intruder and on Senku's orders so that Ryusui can be pieced together easily when he is revived. Ibara is later seen off the coast of the Treasure Island on the ship. As members of the Kingdom of Science tries to retrieve their comrades from under the sea, Ibara looks below the water to see what is going on. However, he did not notice the team take them out.

Ibara selects and escorts Ginro to the room where the Great Leader was at. As Ginro prepares to retrieve the petrification weapon, he sprays Ibara with a solution that was intended to keep him dizzy long enough to get the weapon and go. However, Ibara came to his senses quickly and realiz that Ginro saw the Great Leader as a statue. Furious that Ginro saw the secret that Ibara hid, he chased down Ginro and mortally wounds him by impaling him through the torso. As Kohaku attempts to get the attention of the people in the village to tell them that their leader is currently petrified, Ibara attempts to dismiss her statements as absurd. At the same time, Kirisame uses her petrification weapon to petrify Kohaku and Ginro. After they were petrified, Ibara found the earring that Kohaku was wearing and heard members of the Kingdom of Science talking. He also overhears the members of the Kingdom of Science conspiring to have Mozu on their side. As Mozu tells Ibara and Kirisame about a group of new enemies who are about to attack and as Mozu suggest that Kirisame uses the petrification weapon. Ibara tells Kirisame to carry a fake petrification weapon.

When the Kingdom of Science attacks the people of the Petrification Kingdom, Ibara orders the people on the island to get onto the ship as he prepares to unleash the petrification ray on the entire island. As Ibara is on the Perseus ship, he and Mozu corners Senku, Gen, Chrome, Kinro. Senku uses the de-petrification liquid to depetrify Hyoga and Homura.