User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-92.21.29.42-20190623153730/@comment-120.188.77.159-20190624125112

How about Mitsuya? Judging by just how worried Tobio and Ajuka in the early chapter of Volume 25 when they're discussing what kind of Phenomenon that might happen if He encounter Issei. It seems to like Mitsuya might be Issei's natural enemy or future rival. Not to mention that he can also performed dual BxB. A feat that none of the characters was able to do. And both of his Sacred Gear are Longinus tier.