Ok so here are the pairings I’ve found would work with the two previous Onmyouji:

Keito Haneda [@Sho Minazuki] with Kazumi Omiwa [@Spanner]
Aika Hirabayashi [@Avant] with the Waniguchi [@Pleek]

If you dislike these or decided to make your own shikigami (as I have and posted with my Niko in the characters tab) then just let me know.