Isaac Lahey

Isaac's personality throughout his time on the series has evolved quite a bit since his introduction. At first, he was shown as a timid, shy young man whose abusive father caused him to be fearful of those around him. After Derek Hale gave him the Bite, however, Isaac took advantage of his new powers and enjoyed using them to dominate others, enjoying the feeling of being powerful instead of powerless for the first time in his life. However, after meeting Scott McCall and the members of what would eventually become the McCall Pack, Isaac eventually grew into a more selfless and compassionate person who was capable of having healthy relationships with others, especially after he was informally adopted by Melissa McCall and accepted into both the McCall Family and the Argent Family.