I just realized it now but i think the main reason why i have such a huge crush on kaido right off the bat is because he reminds me of tsuruga ren so much. That shinu black hair, long legs, gentle smile and the way he supports the MC everytime
agreed with most people here.
Going back for a flat personality and cliche story villain that really has already had his arc done and over with.
Should not be brought back for any reason other than not having any creativity to make more interesting conflicts with new problems/antagonists.
There is zero point in having him come back cause she has already overcome that trial and no further character growth is able to be produced from confronting him again.
Unless the author pointlessly regresses the MC.