Fujiwara no Mokou

Fujiwara no Mokou is a character from the Touhou Project games.

Mokou was formerly an ordinary human, but she became an immortal being after drinking the Hourai Elixir about 1300 years ago. Now she is never able to die, though she still feels the pain of injuries as normal. She's considered to be very powerful, given her long life, the power she earned through her life, and her immortal status since she can keep fighting until she can no longer stand the pain.

In the Unlikely Heroes Chronicles fics, Mokou is a member of the Unlikely Heroes and is now an ally with the Heroes Coalition.

Personality
Perhaps due to being ostracized for so long, Mokou is a loner by nature and chooses not to socialize with humans or youkai. She escorts lost humans she finds within the Bamboo Forest of the Lost, giving herself a job similar to that of a bamboo forest guide, and even then after escorting between Human Villageand Eientei, she departs without saying a word. Nevertheless, to those whom she's acquainted with, she speaks bluntly and with lively personality. In Imperishable Night's extra stage, for example, she was easily roused and goes on a rant about how annoying Kaguya is. Not much else is known about her as she doesn't really talk much to anyone.

She's commonly thought of as having an androgynous style due to using phrases like "~na no kashira?" and "~na no yo?" which are considerably women's language, all the while using a belligerent tone and wearing pants, which is commonly thought of as unusual among Touhou characters. Within her in-game sprite, she also keeps her hands in her pockets.

She undertakes the duty of escorting people in the Bamboo Forest of the Lost. Although this may allow her a wider opportunity to socialize with other people, she still remains very reticent about herself. For example, when asked about her past, she doesn't answer with anything other than "I'm an ordinary health maniac who runs a yakitori stand" (it is unclear whether she truly does run a yakitori stand). However, she seems to happily listen to others' talking. Thus, even if someone doesn't lose one's way, it would be possible for her to be enlivened by a conversation.

She presently seems to be very content with her life contrary to being commonly thought of having a pessimistic lifestyle. With an unaging, undying body, she and Kaguya Houraisan kill each other every day, and the text of Imperishable Night even emphasizes this with the line "and she is alive to enjoy it, how magnificent!"

In Inaba of the Moon and Inaba of the Earth, she is shown to be really good at house chores like cooking, although she gets embarrassed when this is noticed.

Abilities
Neither Aging nor Dying

Mokou's inability to die allows her body to receive an indefinite amount of punishment. No matter whether she's beheaded, incinerated or has taken any other form of strike, she'll always revive without exception. Mokou will recover within a few day's time if she takes a non-fatal blow. Due to the nature of the Hourai Elixir she drank over 1300 years ago, she's also incapable of contracting any form of disease or illness. This includes the natural process of aging. It is said she can completely recover even if a single hair remained, although it seems redundant because those who taste the elixir will recover regardless.

Mokou's immortality, however, doesn't prevent her from being susceptible to fatigue. Even though she is incapable of dying, she still feels pain when injured just as a normal human does. It's said that since she doesn't die, feeling the sting of death when she reaches the brink of oblivion brings her a great deal of pain and fatigue when she immediately revives. For this reason, she can be defeated in spell card matches with danmaku even though she's invincible. It should be noted though, that this fatigue may be completely mental since she needs no sustenance such as food or sleep to stay alive.
 * Manipulation of Fire