Houkai Gakuen 2/Guns Girl Z, Honkai Impact 3rd, Honkai Starrail, Genshin Impact, Zenless Zone Zero, Hetalia, Obey Me Series, Love Angel Syndrome, Umamusume, Ongezellig, Undertale (aus), Deltarune, MiSide, Friday Night Funkin', Bandori, D4DJ, TADC, Punishing Gray Raven, Cookie Run Series, Bad Things, DDLC

Kiana Kevin, Liech Swiss/Erika Basch, Rasazy Selever, Dr. MEI, Nahralab, Luna Kindred, Thelema, Sekai, Seruti, Isshiki, Persephone, Vivian, Yanagi, Jane Doe, Remielle, Ronova, Diluc, Firefly, Constance, Topaz, Phainon, Solomon, Thirteen, Mammon, Ukraine (hetalia), Netherland (hetalia), No. 21, Kind Mita, Gangle, Milky Way Cookie, Shiratori Kurumi, Aoba Moca, Seeking the Pearl

kiamei/kiaMEI, kevincest, kialaya, sekailan, songlema, robifly, anhane, miyanagi, sparkherb, abstragedy, natsuri, flamephaikhas, jadepaz, mocaran, kangelame

Era: ZERO
In my personal hc, Kevin is older than Kiana by 3 years and they have the same birthday date and months, December 7. I also make Nina as Kiana's childhood friends as well with Kevin too and then they form a trio.

Retrospective
I have more various hc for this one, them being twins, Kevin being the younger one, Kevin adopted by Siegfried and last they eventually called each others siblings after the Kevin's visual novel story. But I personally love the twins one more.

I have a lot to say about my hc and au for them actually, but it's too much and I'm too shy to talk about it in public, I'm afraid it will sounds too cringe for a lot of people ueueueueu. Maybe I will make a post about it one day.....