Who is that man? I feel like he is Ban and Elaine son

he looks like Ban but the hair color.. idk

That's the samurai participant from the game Dolor and Gloxinia made, there were several players right one of them is Vivian disguised as the male mage. My memory is kind of blurry but I'm sure he's one of them

He has shown up from time to time since ch.158 http://www.mangago.zone/read-manga/nanatsu_no_taizai/mf/c158/pg-1/?av=1

I like his character, so I'm happy to see he has a bigger roll :)