初濑伊纲 (初瀬 いずな, Hatsuse Izuna)是一名曾经作为代表与人类种进行过竞赛的兽人种女孩，在空和白统合艾尔奇亚联邦后，巫女指派她跟随空白并向他们学习。 空和白十分喜欢像抚摸宠物一样抚摸她(尤其是尾巴)，这导致她的祖父十分嫉妒。史蒂芬妮发现其实伊纲与空白有很多相似之处，例如不通世俗、傲慢无礼、耍小聪明以及擅长游戏。
外貌
与其他种类相似，伊纲具有动物和人类组合的特征——她有狐狸般的耳朵和蓬松的尾巴、深紫色的头发和栗色的眼睛（轻小说中为黑色头发和黑色眼睛）。她的瞳孔垂直开衩，类似于猫。
当伊纲使用“血坏”能力时，她的尾巴会膨胀变大，而她身上的所有皮毛都会变红，额头上会出现红色的印记。
人格
空和白非常喜欢她，他们喜欢抚摸她的皮毛，而伊纲似乎对他们有同样的喜爱，喜欢被宠爱。她曾经提到，自己的祖父初濑伊野的抚摸技巧还不如“秃猴子”（空和白）。后来，空白伊纲组成了三人组，发展出类似兄弟姐妹的情结。
由于她仍然在学习人类种语，因此有在每一句话句末都说“です”（desu，的说）的口癖，她本人认为这样听起来更有礼貌，其实这在日语里某些语境中是不对的。另外，她有一种不知不觉说出脏话的习惯，其实她本人并不知道这些词的意思。
她常常表现出与她年龄相符的幼稚性格，但玩游戏的能力却十分强，因此她在艾尔奇亚发动的国家战争中代表兽人种参加了比赛。
在遇到空白之前，她从来没有享受过游戏的乐趣，因为她从小受到训练，玩游戏仅仅是为了胜利。
能力
She possesses all the incredible physical abilities found in all werebeasts as well as the rare "kekkai" ability (aka 'Blood Destruction') found in a select few werebeast individuals (although she is only able to remain in that form for only a few seconds before she risks death).
She has the ability to learn at an amazing rate if what she is learning is game-related as in the case of learning to read the Imanity language from a game book overnight while Stephanie slept (still limited in speaking the language however).
弱点
Despite being considered "mature" among the Werebeasts at the age of eight, she is still naive in adult-related subjects.
琐事
- It was revealed that among Izuna's numerous sibings and relatives (Offsprings of her grandfather and 30 "grandmothers".), Izuna was the only one who inherited Kekkai from Ino.
- She lived with her parents in a residential area, with her grandfather visiting her daily.
图片册
en:Hatsuse Izuna es:Izuna Hatsuse fr:Hatsuse Izuna pl:Izuna Hatsuse ru:Изуна Хатсусе