Tewi Inaba

Eirin Yagokoro: Tewi made a deal with Eirin to defend Eientei in exchange for Eirin imparting her knowledge to the rabbits. Thus Eirin is an ally, employer and teacher to Tewi and Tewi appropriately addresses her as Master. Eirin realizes Tewi's importance to Eientei due to her control over the rabbits and despite Tewi's pranks, knows that Tewi is there whenever they really need her, should the circumstance arise.

Reisen Udongein Inaba: Reisen is Tewi's fellow Earth rabbit serving under Eirin. Unlike the youkai rabbits, Reisen acts as Tewi's superior, ordering Tewi around and being in charge of looking after her. It is, however, completely up to Tewi herself whether she listens to Reisen or not. Around Eientei, Reisen also tends to be the unfortunate primary recipient of Tewi's pranks.

Gensokyo's youkai rabbits: All of Gensokyo's youkai rabbits obey Tewi. Tewi knows every single youkai rabbit currently in Gensokyo, although this does not stem from the psychic connection that rabbits have. If a new youkai rabbit hypothetically came into being, Tewi would not automatically know about it, although youkai birth rates are so low that Tewi would probably find out very fast.

Kaguya Houraisan: Since she's the princess Eirin works for, Tewi knows who Kaguya is and shows respect to her though she doesn't completely change as a person only being a bit more respectful than she is to Reisen

After taking good care of her health and living for a long time, Tewi Inaba became a youkai rabbit. She had become known as the Rabbit of Good Fortune amongst humans, for the good luck she brought them. She may be more than 3,000 years old (inferred from a statement she made in Chapter 18 of Silent Sinner in Blue which can be interpreted as her having known Lord Daikoku (also known as Ookuninushi) personally,which would explain why she was confident that he made better medicine than even that which Eirin Yagokoro was preparing). It's possible that she's the White Hare of Inaba, itself. She has existed since the Bamboo Forest of the Lost was known as "The Tall Grass Cluster" and is said to be the only being that knows it completely. However, it appears she never found out that Lord Daikoku, whom she reveres so much, was taken captive and is sealed at his shrine in Izumo to this day. She and the earth rabbits continue to pound mochi in his name.

Tewi had lived in the Bamboo Forest before Eientei was built. Despite Kaguya Houraisan's power over eternity concealing it, in Cage in Lunatic Runagate Tewi said that she knew that it was always there. She finally made herself known to Eirin Yagokoro after a few hundred years. She was master of the Bamboo Forest and the rabbits that lived there.

Eirin and Tewi made a deal. Tewi would protect Eientei from humans, and in return, Eirin would spread her knowledge to the rabbits. Perhaps this was so the beasts could keep up with the youkai, Youkai Mountain, humans, and (later) vampires in Gensokyo's delicate power balance in Perfect Memento in Strict Sense.

Tewi has dark red eyes, black shoulder-length hair, and fluffy white rabbit ears, and wears frilly socks in a frilly pink-white dress. Tewi is also pretty short, at least being as tall as Reisen's chest

Tewi Inaba is a youkai Earth rabbit who leads other Earth rabbits in the Bamboo Forest of the Lost while living and guarding Eientei. Tewi is described as being acting more like a fairy than an actual youkai with being childish in her way of speaking and acting; specially with Reisen, who is the target of her pranks and she hides from the moon rabbit to annoy her. Despite her childish appearance, she is one of the oldest Youkai in Gensokyo who has lived for more than 1,000 years before the first Gensokyo Chronicle was written (if she really was the White Rabbit of Inaba, she would have existed since the early of 8th century) and is very wise and cunning. It is also noted that she doesn't care about selling her own species to humans if she knows that they will abandon them; which would make the rabbits become youkai too. Tewi is a very lighthearted and playful youkai, and is known to lie at times. In Phantasmagoria of Flower View, she even tries to swindle Aya Shameimaru out of some pocket change. She is also considered to be the leader of all the earth rabbits in the Bamboo Forest of the Lost. It's said that there is not a single youkai rabbit unknown to her, and that all of them will only ever listen to her. Reisen said that the youkai rabbits only follow her, which indicates that she has a clear ability of leadership. Furthermore, she is charge of the Bamboo Forest of the Lost, and Eirin, Kaguya and Reisen can live in Eientei with her permission in exchange of "lending their knowledge on the rabbits" and, as part of the forest, she will defend the mansion