This is a list of tags that focuses on Touhou Project characters and their breasts. Most tags will have the characters depicted with a larger bust, though there's a few flat-chested tags in here. For an article on consensus regarding size, see the Touhou Boob Discussion article.

^{Note: In order to keep these charts up-to-date, the original article's most recent edit was on 2023-04-26.}

For the most part, ZUN states that the characters resemble teenage girls,¹⁾ so they wouldn't have breasts.²⁾ He also states that their child-like personalities help shape Gensokyo's atmosphere.³⁾ Uniform with other anime and manga, the characters don't really age,⁴⁾ but it has been mentioned that the some characters can stunt growth for enteral life (e.g. Remilia)⁵⁾ or change their forms (e.g. Wriggle, Suwako, Nue).⁶⁾⁷⁾

It should also be noted that ZUN often uses “kodomo” (子供) or “shoujo” (少女) as descriptors, almost never calling them a “loli” (ロリ) or “lolita” (ロリータ).⁸⁾⁹⁾ All technicalities aside, some semi-official artists have a tendency to make certain characters look more mature, such as Yuugi,¹⁰⁾ Kasen, and Byakuren,¹¹⁾ then you could make an argument that Seiga and Junko are technically widows.

• Mitori Kawashiro, a fake character invented by /news4vip/, has the "Mitopai" (みとぱい) tag.
• This article used to have an actual list, until the chart on Niconico Encyclopedia was discovered and was more pleasing to look at. Since then, all “List of X Boob Tags” pages borrow this chart format.

• List of Character Boob Tags
• Touhou Boob Discussion

• List of Touhou Boob Tags on Pixiv Encyclopedia - The main article.
• List of Touhou Boob Tags on Niconico Encyclopedia - It hasn't been updated since 2011.