Busou Renkin, Naruto: Shippuuden Recommendations
Same theme going here. Central main character who has an unbelievable kind of power trying to stop evil from taking over the world. The main character is fighting to protect everyone he knows and loves.
if u know orochimaru that the main bad-guy for buso renkin is literally almost excalty the same (just change the snake to a butterfly); purple, evil, and very very g-
anyway both naruto and kazuki have that "will to never give up" thing