The Seven Deadly Sins - Vol. 24 Ch. 197 - Their Respective Answers

[MangaDex]

 

[KelpTheGreat]

In case anyone's confused by what Gowther's saying in the last panel of page 18, he's literally just saying onomatopoeia out loud. He's kind of doing a parody of sentai or magical girl shows, where they show up and state their name, along with a fancy sound effect marking the characters' entry.