Kazedu Uzumaki

Kazedu Uzumaki is the brother of Kushina Uzumaki. Not much is known about him exept that he will appear in Ultimate avatar's fanmade manga which will be on the wiki tommorow

SPOILER
THIS IS A SPOILER SO IF YOU HAVEN'T READ THE FANMADE MANGA YET AND YOU DON'T WANT TO BE SPOILED, STOP READING.

From the information given, we know that he holds the 12 tailed beast inside of him and his seal allows him to control it and transform at will.