Isaac Lahey is a tall, lean teenager standing at 6’2” (188 cm), with dirty blond hair, blue eyes, and fair skin. He usually wears hoodies, jackets, and jeans. Quiet and guarded, Isaac can be sarcastic, stubborn, and occasionally cocky. His past trauma leaves him insecure and hesitant to trust others, and he sometimes acts impulsively or lets his emotions influence his decisions.