Scars
Ronald Weasley
Ronald and Hermione Weasley fought like cats and dogs. It was an undeniable fact, especially if you had ever met the entire Weasley Family. The two, being as stubborn as they were almost always dragged their fights on forever until finally one of them would suck it up and apologize. Almost always this person was Ron Weasley.
Every time he and Hermione fought, Ron had an undeniable habit of clenching his large hands into fists. As they would storm away from each other he often had the urge to punch something, and that is when he would see it.
Right before throwing his hand into a wall, or sometimes, unfortunately, much later, Ron would see his two fingernails missing. Remembering the time when they fought and he didn't apologize and he left her and she almost didn't take him back was just too much for Ron. The idea of it becoming a reality was just unbearable.
As brave a Gryffindor the war may have made him, Ron still had one giant fear: losing Hermione.