If I recall correctly, a lot of the people in the infamous Final Fantasy VII House were also FtM, which was unusual at the time. They were from an area of fandom that called it "soul-bonding," but it's just another term for that same over-identification with a character.
I think "kinning" is an attempt to make it seem more spiritual and thus respectable. Kind of like when someone declares a character is "my comfort character" and thus immune to accusations of being problematic; they're trying to use the language of mental illness to justify the anime they want to bone.
This does seem like it's relevant to troonery, especially the fandom fakeboi kind. There was a brief illustrated discussion in the
TF2 Community thread. (
Lot of FtMs in the TF2 fandom, but don't worry; they don't actually play the game. Fans who play the game are bronies who went MtF.)
Finally my time has come.
Alright, SOUL BONDING is it's own can of nuts to a degree, or it used to be but I think it overlaps more with kinning.
Soul Bonding is pretty much I WAS THIS PERSON IN ANOTHER LIFE. As you brought up, in the FF house, Jen was a soul bonder who claimed in her previous life, she was Hojo and she would do that meditation shit to FF music reconnect to her previous life or do other shit to help her connect to said previous life.
Kinning ranges from "Hah I related to this character" to "Oh I AM this character DNI IF DOUBLES OR POST NEG ABOUT X CHARACTER HERE CAUSE IT'S ME DON'T REALITY CHECK ME".
Kinning has other stuff like kin SHIFTS which is notable to bring up.
Kin shifts are pretty much this days modern mood ring? I brought it up a while ago in a dangan thread here, but pretty much a kin shift is like this example. (I made this up on spot btw)
KIN LIST: Donnie Darko, Nagito Komaeda, Naruto Uzumaki, Eren Jaeger, and Shinji Ikari
CURRENT KIN: Shinji Ikari
Usually these would like enact more LARPING SHIT or a mood list of like
Naruto- Ready to chat sorry for spam!
Nagito- VERY good mood, might not talk much but please talk!
Eren- i'm pissed don't talk to me unless your xyz.
Donnie- I'm not feeling very well guys, close mutual's only
Shinji- DNI UNLESS VERY CLOSE WITH ME. (usually leans towards TW/RANT type behavior and suicide baiting/ deactivating acc threats)
Hey! Thank you for checking out my profile uwu. I use kins for my
insert excuse here and I kinshift regularly! DNI IF DOUBLES THAT MAKES ME UNCOMFORTABLE, ASK TO FOLLOW IF YOU KIN
insert character here ETC.
Course now it deals with UWU FAKE METNAL ILLNESS UWU IM MENTALLY INSANE GUYZ XD shit now so I can see why it's confusing to mix soul bonding and kinning with one another since they used to be VERY separate entities or at least different things under the same umbrella.