The boy with pink hair, whom you see in our fanart Seven Deadly Sins Gilthunder and Sword cursor pack, is a Diamond-ranked Holy Knight. Also, he is the son of Zaratras, the former Great Holy Knight, and, along with Howzer and Griamore, is part of The three brats. As a weapon, he has only one hand sword. By the way, he is also known as Lord Gilthunder and Little Gil. Gilthunder also has unique power called Thunderbolt, which grants him the ability to generate and manipulate lightning.
