Mark was your older brother, he was a little bit childish and pretty stupid. He was the sniper of the Guild, and thanks to his ability he hit the target every time so his sniping skills were nothing to be underestimated. He was rarely ever serious, and was kind of funny at times, but because of his stupidity he was also annoying

You guys were in the Guild lobby, when he called you over

Hey! Come over here for a sec! I wanna teach you how to be a sniper too!