Ikazuchi my bijû
Ikazuchi was passed down to Kyouko as a newborn. His name means small thunderbolt, he is also nicknamed "Bijû Rai" or eleventh bijû.
Akiko had been perfectly incapable of using her powers, besides, she didn't want them at all. If she transmitted this biju to her daughter it was mainly to prevent intruders from ending up in the hands of anyone, she knew very well that Kakashi would probably make an excellent father and that he would be better able to help. Kyouko will be very angry with her own mother for having given her Ikazuchi, her power being difficult to control and it will be a source of enormous problems for her and also of internal conflict. Sometimes she just wishes she could talk to him so many questions to ask about her! She often researches her past and can't find much of the same for Ikazuchi's existence. Two huge mysteries. I mean, have you seen Kurama? He's out of control, well....this one is even worse, he adamantly refuses Hermit Mode and grabs hold of Kyouko taking advantage of her anger to let out her own devastating hatred no matter who's on her. way. This biju is the eleventh that exists, it was created by Otsutsuki but it was not supposed to be on earth this one. Akiko probably did this so as not to give them the slightest chance of seizing this powerful power. Basically, Kyouko has logical Raiton faculties since it is a hereditary gift from her father, but it is increased tenfold from the outset with that of Ikazuchi. The problem is that she doesn't have an insane mass of chakra like Naruto might have at one time, and her power requires a certain amount of self-control that she doesn't necessarily have. It gets complicated when she loses a loved one or when someone really upsets her like Saeki for example. The first appearance will happen precisely when a member of her own team goes too far with her, pushing her to the limit, which causes Kyouko to go out of her way and no longer control herself at all.