The popular pairings for Boyfriend are Jeongmin and Hyunseong, Donghyun and Minwoo, and then the Jo twins (obviously)

Why not mix bands??? Like take members from one band and pair with another?? For instance, Got7's Yugyeom with BTS's Jungkook, etc.

Idk for A sorry xP, B: SuDo, KaiLay/KaiXing, XiuChen, HunHan, BaekYeol :)
C: idk much about then, but MarkSon!
D: TaeKook, YoonMin, NamJin, Jhope forever alone
E: JongTae, MinKey, onew forever alone xD
F: Oh god so many! EUNHAE! WonKyu, KangTeuk
G: DaeJong, BangHim, YoungLo
H: JRen or BaekRen, MinRon (idk if thats what theyre called, but Aaron + Minhyun)

DAEJAE FOR LIFE ESZ

DaeJong couple (daehyun+jongup)/DaeYong coulpe (daehyun+yongguk)

KyuHae couple (kyuhyun+donghae) suju

Hyun couple (jonghyun shinee+baekhyun exo)
MarkSon couple (mark+jackson) got7

As long as you don't have the cliche pairings, (I.e. kaisoo, jongkey, 2min, haehyuk, etc.) Any pairing is fine with me. All of the regular pairings really annoy me and I don't know why.

Bap:
Daejae (youngjae and daehyun)
BangLo (Zelo and Leader)
Himjong( jongup and Himchan)

Or it could be JongLo (Jongio and Zelo)
BangHim (Leaser and Himchan)
Super junior:
EunHae (eunhyuk snd Donghae)
Yewook (yesung and ryeowook)
Leeteuk and Kangin
Siwon and Kyuhyun / kyuhyun and sungmin
Heechul and hangeeg Hanchul

Exo:
Taoris
Baekyeol
Kaisoo
Hunhan
Xiuchen
Sulay

Shinee:
Jongtae (I love this ship)
Minkey
Onew + chicken XD

EXO:
Kaisoo
Baekyeol
Hunhan
Taoris
Xiuchen
Sulay

For SHINee There Is-
-2Min
-Jongkey
-And A Lonely Onew :(

For EXO there is-
-Kaisoo
-Sulay
-Baekyeol
-Hunhan
-Taoris
-Chen/Xiumun

i only know exo's:
kaisoo
baekyeol
hunhan
taoris
sulay

On EXO the most used would be

TaoRis
XiuChen
SuLay
ChanBaek
KaiSoo
HunHan

tho there are those that use KriSoo, TaoHun, SuChen, XiuLay, XiuHan, KrisHan, KaiBaek, ChanSoo, KrisYeol, BaekSoo etc.

As for Nu'est

There are those that most likely ship Ren to the remaining members.

MinRen
BaekRen
JRen
ARen

There's also MinRen tho etc. :)