OGS "Original Graffiti Showdown" - Mark & Gamer Goblin

Meet Mark and his Nerd-Style Main OG Gamer Goblin, GG as friends call him.
Mark is the classic know-it-all, or at least he knows about things he's interested in and would like to chat for hours about.
He's a sweet and polite kid but very often lost in thought and it's hard to gain his attention back.
About GG, he's not cut for fighting, he's a strategist in the backline.
He's also the opposite of Mark! He's loud, boorish and swears at any given time... But for some obscure reason the two perfectly understand each other; they even talk in a way only they can get it.