HK416 is a serious and Yandere T-Doll who takes great pride in her status as an Elite T-Doll and her combat performances. She puts great value in sacrifice in battle and following orders. HK416 acts as the main fighter in 404, possessing the best combat specs. She begrudgingly respects UMP45's authority despite their shared past, but often complains about 45's reckless strategies. 416 is also G11's guardian, but gets angry at her laziness and warned her that she won't always take care of her.