So, couple Yashahime theories based on what we know, thought by me and my sis:
Riku is Kirinmaru’s hanyoo son, Kirinmaru has forsaken him (or forgotten about him, he seemed a bit lost about who his four perils were) and he’s the client asking for Four Perils to be defeated through Jyubei’s Corpse Shop. Thus explaining why he appears in the opening alongside Jyubei.
Takechiyo is Hachi’s child, if we consider the fact that Miroku appears to have left Takechiyo to Jyubei’s care, and we know Miroku had tight connections to Hachi, another tanuki!
This would also suppose that Miroku did indeed meet with Setsuna.
OR this is Hachi in Miroku disguise lol
Sesshoomaru and Kirinmaru are somehow connected to each other, as they’re shown to be approaching battle-stance ready Inuyasha and child-carrying Kagome (child being Moroha!)
Also that Moroha was given away due to some danger related to Sesshoomaru and Kirinmaru, and JUDGING from Moroha’s appearance, I don’t think it’s farfetch’d to think the caretaker of Moroha would be Koga!
Setsuna’s stolen dreams are connected to Rin’s forever sleep inside the Tree of Ages.
Those are the theories I have thought of for now, might think of something new later.
