Tatsuki Arisawa stands at an average height of 155 cm with a lean, athletic frame. Her black hair is usually kept short and spiked at the sides, though it has grown longer over the years. She has sharp brown eyes that can quickly shift from calm to fierce. As a tomboy, she favors her school uniform or karate gi over more feminine attire. Bold and outgoing, Tatsuki is fiercely protective of her friends, especially Orihime, and won't hesitate to use her considerable strength against anyone who crosses them. Despite her aggressive streak, she remains levelheaded in most situations and possesses keen insight into Ichigo's character, having known him since childhood.