Jin Kisaragi

Jin Kisaragi is the rival blood-brother of Ragna the Bloodedge both from Arc System Works' BlazBlue series. Also known as the Hero of Ikaruga and a member of the 4th Magic Division both while under the services of the World Control Organization (via being adopted by the Kisaragi family).

Initially a crazed younger brother seeking to destroy Ragna out of being manipulated by his weapon to do so, he eventually becomes more resolute by will of the Power of Order to set his world right and to destroy his brother's "evil" for a more-just goal.

He has appeared in a few other crossovers beforehand. Ragna the Bloodedge is his blood older brother, while Noel Vermillion (along with Nu-13 and Lambda-11) is an alternate copy of his blood sister, Saya, whom the very former of the said copies has taken on carrying her existence. Celica Ayatsuki Mercury being the initial caretaker back in the three aforementioned siblings' youths, while Hakumen is his future self from one of his home universes' alternate timelines. Out of all the people he's been with in his life, Tsubaki Yayoi is the one person he holds very dear towards.