Byakuran

He is shown to have a cheerful disposition around his subordinates, especially toward Irie Shouichi. However, this is only if they hold his interest, hiding his ruthlessness and cruelty behind. Once he "gets bored" of someone, he won't hesitate to have them killed. He will do anything to achieve his goal, not caring if it would mean sacrificing innocent people or destroying the world and even referring to them as his toys.

Due to the actions committed by his future-self, he is considered the main antagonist of the Future Arc. In the present, he is chosen as Yuni's representative in the Representative Battle of the Rainbow.

Initially, his aim was to obtain the "Ultimate Power" (Tri-ni-set) by gathering the Vongola Rings, Mare Rings, and Arcobaleno Pacifiers together in one place; he has a portrait with a slot for each item. To achieve his goals, Byakuran has ordered the complete extermination of the Vongola Famiglia, even targeting their friends and allies.

In the present time, however, after his future-self was defeated by Tsunayoshi, Byakuran seems to have had a change of heart even though he still retains his carefree and easy-going personality, which Gamma finds annoying for most of the time.