Ragna the Bloodedge

Ragna (AKA his full moniker of Ragna the Bloodedge) is the protagonist of Arc System Works' BlazBlue series, and was initially an SS-rank rebel with a massive bounty on his head in his home universe all both his crimes and for possession of his "Pale Blue Grimoire" (AKA the BlazBlue) taken form as his amputated right arm due to a traumatic event that also cost him his family by the hands of Yuuki Terumi which set him on his quest for revenge.

Later on, he realizes that he was tangled in multiple-various timelines centered around himself unknowingly as he questions what he truly is to be fighting for throughout the C-series of BlazBlue. However, events leading up to the Infinite Universe's creation have left him alive as a Chronophantasma, despite ending up written out of existence in his home universe.

He has appeared in a few other crossovers beforehand. Jin Kisaragi is his blood-brother raised by the Kisaragi family, 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. Rachel Alucard and Juubei/Mitsuyoshi are two of his primary guidance figures, with Celica Ayatsuki Mercury being the initial caretaker back in the three aforementioned siblings' youths.

Intro into Fighters World
Check out Ragna's new movelist here! http://variation-force-fighters-world.wikia.com/wiki/Ragna_the_Bloodedge/Fighters_World_Move_List