Amagiri refers to her as Kikuzuki in his DLC story, “The Waxing and Waning of the Moon”, for Stories of the Shinsengumi:

I’m not sure if anyone else ever says it in canon, but Amagiri’s word is good enough for me!

Who do they see as their best friend? Their worst enemy? Kimigiku doesn’t have a ‘best friend’, but she is on good terms with most of her fellow geisha in the Sumi—human or demon—and considers Sen something of a friend in addition to a superior. As for her enemies, anyone who threatens Sen and/or Yase is fair game, but she prefers not to hold personal grudges since they take up valuable energy she could be using more constructively.

If they were to fall in love, who (or what) is their ideal? Kimigiku is duty-centric enough that she doesn’t spend a lot of time thinking about romance. Additionally, as a female clan head, her options are extremely limited, and she is pragmatic enough not to want to get her hopes up. That said, if she had her choice, she would prefer a partner who allows her quite a bit of freedom; understands that her first great love is duty; adheres to demonic tradition; and conducts themselves honorably.

How do they express love? As regards her patrons, Kimigiku behaves as is expected of a geisha; there’s a reason she’s the second-highest-ranking variety of oiran. Apart from that, she does not maintain many personal relationships of any kind, so both platonic and romantic love manifests more as unconditional support. If their goals align, she is more than willing to do whatever her allies ask to prove that they can rely on her, even if it is dangerous. Additionally, in matters of ensuring happiness and comfort, her intuition is so good that she does not often need to ask what her allies need from her, although she tends to shy away from most emotional intimacy.

I’m all fanfic’d out, so unfortunately I can’t illustrate this, but I think the best way to describe it is “quietly ecstatic”.

Amagiri and Kimigiku have been married for some time, and while they haven’t been trying for a baby as frequently as Kazama and Sen, having children is definitely one of their priorities. However, after several months with no success, it’s beginning to wear on them both enough that they’re considering readjusting their pacing/strategy. But now there’s no need for that, as their prayers have been answered. Kimigiku would be tactful about letting Amagiri know, of course. She’d come up behind him one evening as he reads, putting her arms around him in a loving embrace, and whisper in his ear.

“I have good news,” she’d tell him. Amagiri wouldn’t even need to respond; she knows to take his silence as encouragement to continue. “You’re going to be a father.” And while it wouldn’t be a surprise since they have been trying, Amagiri can probably count on one hand the times his heart has ever skipped a beat like this. He’d set his book down slowly and turn to look at her, to find her eyes shining. This is what they’ve wanted: a scion for both their clans, and a family of their own.

Even though they both know he heard her perfectly well, he’d ask her, softly, to say it again, because of all the beautiful sounds that have passed through Kimigiku’s perfect lips, those words are some of the loveliest he’s heard yet. She’d oblige him, of course. And then they’d share a tender kiss in celebration of new beginnings, and discuss breaking the news to everyone else.

What-ifs/alternate timelines

What if Hijikata had been injured in Osaka instead of Sanan? Would he have made similar decisions? In the event that he drank the Water of Life, would he remain in the forefront of the Shinsengumi or be presumed dead like Sanan? What role would Sanan take instead? How would this affect the plot and characterization in general?

What if Hijikata was as popular in Shimabara as his historical counterpart? What if he and Kimigiku had a dalliance, as in history? How would this romance affect his personality and actions, if at all? Would Chizuru still be in the picture for him, or would her ‘canon’ love interest change accordingly?

What if Hijikata and Chizuru’s relationship was assumed to have escalated much earlier on, given the traditional roles of a samurai and his page? Would Hijikata try to prove these rumors wrong somehow, or would he act on them instead? Would Chizuru? In the latter case, would theirs be a romantic connection, or purely physical? Would that affect Chizuru’s other prospects?

The closest thing to established canon we have is that Sen is referred to as “Suzuka Sen” in SSL, due to her connection to Suzuka Gozen. However, her alleged ancestor in Demons’ Bond is most often referred to as “Princess Yase” instead, which I find more plausible. Meanwhile, Kimigiku (real name Kikuzuki) is stated to be a member of a clan that has protected the princesses of Yase for generations. That implies that she is of the same clan as Suzumori Yukina, who guards Princess Yase in DB.

So, short answer: I have their full names as Yase Sen and Suzumori Kikuzuki, but there is no canon answer for either one.

Best places to kiss on their body

She may kiss her customers, because that is a part of the game she has agreed to play, but she is not theirs to kiss. Human mouths are always indiscriminately hungry, and her flesh is not theirs to savor. Even the few demons that visit establishments like this have walked among humans too long, either learning their habits or proclaiming their superiority. But, though she has never been clasped in the arms of a true lover, she imagines the sensation often. Just a simple, chaste, reciprocal kiss on the lips—not her advance, because she must, but theirs, because they love her—would be enough.

Humiliating memories

Mizuage. As a maiko, she made sure to excel in all areas of her training, just like her mother before her: even as a girl, she was not a woman to be outdone, even by her predecessors. But to be auctioned off like a common human in preparation for becoming a fully-fledged geisha—she couldn’t help but delay it as long as possible, years after she was deemed ready to graduate, because she was terrified of losing an irretrievable part of herself. And even though they accommodated her wishes, and even allowed her first to be a demon of Yase, she couldn’t help but cry all the same. Her face burns to think of how frightened she once was of something that has now become so ordinary to her. After all, if a man pays her mizuage, what woman can be so heartless as to repay him with tears?

People who’ve influenced them greatly

There is the Princess, of course, but her lady’s parents were the ones she grew up serving first. From a young age, she practically lived in the palace alongside them, learning her duty by example as the youngest leader of her clan in generations. The former Princess and her consort instilled in her many of her current ideas of what it truly means to be a demon, regardless of blood purity, and encouraged her in developing all her skills almost as if she were their own child—but always with the same gentle distance her lady shows her now. They taught her what it meant to govern a clan as surely as they taught their own daughter, and she will be forever grateful for that.

“Amagiri,” responds Sen promptly. “Despite his position on the other side of the humans’ conflict, he is the most likely to give me an impartial perspective. I am sure that Kazama and Shiranui would try to lead me astray—either to further their own interests, or simply for their own amusement.”

Kimigiku inclines her head, giving a faint smile of approval. “Indeed.”

Heading back to the characterization ask meme I still need to wrap up, with another character I don’t write as often as I should: my beloved Kimigiku, otherwise known as Kikuzuki! Because of that, these are a few things I personally try to keep in mind when I’m getting inside her head than things I’ve seen other people do:

“Absolutely not,” growls Kazama. “Our existence is what we make it—no more, no less. Nothing, in this world or out of it, could ever have absolute command over all possible outcomes, and I refuse to believe there is only one.”

Kimigiku gestures for Chizuru to go first, and she clears her throat timidly. “I don’t know,” she says. “I don’t think our futures are destined to stay the same all our lives, but I’ve always felt pulled in certain directions. And sometimes I get premonitions, or feelings like I’ve seen this all before.” She hesitates. “I don’t know if that’s fate, but… it’s the only explanation I have.”

“I agree,” says Kimigiku softly. “Our futures are made up of our actions in the present. While I believe we have the choice to ignore our destined path or follow it, I cannot deny that there seems to be that foundation.”