Byakuran (白蘭)
The First Boss and Leader of the Millefiore family during the future arc. He is originally the boss of the up and coming Gesso Family. He appears to insist that his subordinates call him by his name. His name means "White Orchid". Thus far he is shown to be in charge, however he may be taking orders from Uni behind the scenes.
He is extremely ruthless in his goals and has nearly exterminated the Vongola Family. He has not only targeted the Vongola family but all of their allies as well. Byakuran has also ordered that not only members of the Vongola Family be killed, but all of their family members, their friends, and everyone who would help them; this is known as his "killing sweep." Takeshi's father was one of the first to fall in this manner. Byakuran is in the middle of expanding his "killing sweep" to include even more people.
It has recently been revealed that Byakuran has gathered great amounts of information about Tsuna and his family from the past. He has Shoichi Irie researching time travel by analyzing the ten-year bazooka. His plan is to travel to the past to take the Vongola Rings from Tsuna, as they were destroyed in his timeline by the adult Tsuna. He also reveals a large painting inside the Millefiore tower, with three conjoined rings, with slots for all the Millefiore Mare Rings, the Vongola Rings, and the Arcobaleno pacifiers.
Byakuran wears a Mare Ring with outstretched wings, identifying it as the most powerful of the Millefiore rings, and most likely uses a Sky attribute flame like Tsuna's ring. He later battles with Mukuro Rokudo, who was posing as Leonardo Lippi, Byakuran's would-be new subordinate. He was far more than Mukuro could handle in battle, and uses a currently unknown attack that Mukuro was trying to learn about. He has purposefully hidden what he is capable of in order to gain the upper hand in the war. The final outcome of the battle is unknown, however Byakuran had no use for Mukuro as he did not have a Vongola Ring and their battle in the chapter ended with him about to strike. He later appears and tells Irie Shouichi of the spy (Mukuro) and that he was taken care of. He also warns of the high probability of an upcoming Vongola attack.
informations take from wikipedia.