- 但与上述相反，在东方儚月抄 ～ 月のイナバと地上の因幡中，辉夜是一个想探索永夜亭外部世界的避难者。
- 名字辉夜就意味着光辉之夜晚。蓬莱山则来源于蓬莱神山。 为了找到蓬莱山的位置、逃离危险，也为了能够欣赏那里美丽的夜晚（就像有些地方的“赏月”习惯）。蓬莱山上明亮的月光是一种超越尘世的美丽。
- Popular nicknames for Kaguya among her fans in Japan are "Teruyo," which is a deliberate mispronunciation of the kanji in her name, and 「ぐや」 ("guya") which is an unusual abbreviation of her first name, ommiting "ka."
- A silhouette of Kaguya occupies the front of Imperishable Night's jewel case.
- Also in Inaba of the Moon and Inaba of the Earth, she is depicted as a terrible cook, and as innocent and naive.
- Kaguya and Mokou fight to the death every chance they get. Their relationship has been characterized as a constant "Tom and Jerry" back and forth battle.
- However, in Inaba of the Moon and Inaba of the Earth, Kaguya and Mokou's relationship seems much more casual instead—though that might be due to the carefree attitude of the author...
- Kaguya's appearance closely resembles that of Hazuki, the cat-ear-wearing vampire girl from the anime Moon Phase. Because of this, Kaguya is often depicted with cat ears, either real or fake, on her head, even occasionally uttering lines from the anime's opening song, "Neko Mimi Mode". The cat-and-mouse dynamic between her and Mokou adds another layer to this depiction.
- In more serious doujin works, Kaguya is often depicted as having been driven insane or mentally unhinged as a consequence of her long life and inability to die permanently. However, in official works, namely Perfect Memento in Strict Sense, Inaba of the Moon and Inaba of the Earth and Cage in Lunatic Runagate, she is described as having a more cheerful and pleasant, if somewhat ditzy, personality, who likes to tease Reisen just like all the cast of Eientei.
- Kaguya is also the name of a Japanese lunar-orbiting probe launched in September 2007 as part of Project SELENE to map the moon's surface. At the time of the launch, fanart depicting Kaguya being "sent back to the moon" aboard the satellite, usually against her will, was popular (one tribute video even superimposed her theme music over footage of the launch of the rocket). The same probe was later intentionally sent crashing into the moon, giving way to a new surge of fanart. (Example)
- Since she is generally acknowledged to be easier than Remilia, Yuyuko and sometimes even her servant Eirin, Kaguya is thought rather weak for a final boss (although most bosses in Imperishable Night are considered easier than those in earlier games, and continues are not allowed against Kaguya, unlike the previous two). As a result, fanworks often depict her as being completely helpless and dependent on Eirin to survive, and her theme song's climactic passage has had the words "Eirin, Eirin, tasukete Eirin!" (Eirin, Eirin, help me Eirin!) set to it by the fans. However, Kaguya has a larger spellcard arsenal than either Remilia or Yuyuko and attacks confidently and without hesitation in the actual game. In addition, considering she was scrapped from Touhou Hisoutensoku for being overpowered, Kaguya being weaker than other bosses might not necessarily be true. Indeed, if one takes the Final A route in Imperishable Night, it is actually Kaguya who aids Eirin for Eirin's final spell card.
- It can be conjectured that Mokou and Kaguya's rivalry symbolizes for the cycle of the Sun and the Moon: Kaguya, the Lunar Princess, and Mokou, who uses as an in-game avatar a fire bird that strongly resembles a phoenix.
- Kaguya was planned to debut as a playable character in Hisoutensoku, but was scrapped from the lineup due to time constraints. ZUN stated in an interview that her moveset as initially designed would have been overpowered and unbalanced the game and there was not enough time to properly balance her strength against the other characters (ironically the same issue was encountered with Mokou, who was also intended to be playable in the game).
东方永夜抄 - キャラ設定.txt
<toggledisplay showtext="显示设定" hidetext="隐藏设定">
Aya reports on the "Lunar Capital Expo" being held at Eientei. The event seems to be popular among both the humans and youkai. Throughout the course of her report, Aya subtly hints that some (or possibly all) of the exhibits are fake. Aya then interviews the (self-proclaimed) rabbit from the moon, Reisen, and notes that the line for "moon rabbit" mochi is extremely long. She ends her report with a request that her readers visit the Expo.
In her follow-up, Aya interviews Kaguya on the apparent success of her Lunar Capital Expo, which Kaguya appears to be unsure about doing again. Kaguya explains that her exhibits were mainly antiques from around her house, but when questioned about their age and the authenticity of the stories behind them, won't give a straight answer, saying that people can believe what they want. Kaguya then reveals that her lineage is a long series of dilettantes (NEETs).
- Kaguya is considered the princess of Eientei.
- Eientei is a mysterious mansion with lots of rabbits.
- Its existence only became known when Eirin started selling medicine.
- Recently Eientei has begin to host public events, though.
- Kaguya is refined at conversation, and will tell old stories to those who will listen.
- The power to manipulate eternity is essentially the power to prevent change. It is similar to stopping time.
- It is thought that the existence of Eientei was concealed by this power of eternity.
- The power to manipulate the instant (or rather, extremely short time durations) allows Kaguya to do things almost instantaneously.
- Kaguya's spell cards all make use of special magical items.
- While casting spells, she uses none of her own ability.
- Her danmaku seems to have no specific theme, aside from the rare items themselves.
- Modern Lunarians may not be adapted to spell card use.
- Marisa wonders where Kaguya keeps these rare items.