First off, I totally love the huge analysis from Temp, really great stuff about what makes the series so compelling.
Shiori is delightfully sinister while Miko feels too goody-two-shoes and boring. I like high-octane drama.
Second off, I totally disagree with this commentary, in fact I would say it’s the opposite. Miko is a super complex character, with a lot of interesting character drama and angst. She was the guardian spirit of Hinako’s family, her entire purpose in life was to safeguard her whole family but she failed. She failed to fulfill their prayer the time when it mattered the most, and that has defined her entire life since that moment, just as much as it defined Hinako’s life. Miko is crushed with guilt, and yet she has this primal urge to eat Hinako, and it takes all of her self control to do so. The easiest thing to do would be to leave Hinako to ensure she never gives in to that desire, but she persists because her commitment to Hinako and the promise that she failed to keep is her driving force through all this. The internal struggle between her desire to keep that promise and her taste for Hinako’s flesh and blood makes for a great internal conflict, much more dramatic and complicated than Shiori’s straightforward monsterous nature.
And add on top of that her feelings when she sees Hinako, the person she’s sworn herself to protect, chatting with a mermaid who wants to eat her, knowingly so. It tears her up inside, and even more so that Shiori is able to get close to Hinako in a way she herself still can’t do due to her inability to give Hinako what she wants (death) and her own bloodlust keeping her away.
She clearly feels real affection towards Hinako, but distances herself out of fear of what she might do to Hinako if her self control were to lapse for even one moment. Shiori doesn’t care about Hinako, and probably never will. She just wants her to be happy for the service of her own selfish desires.
I’m fully ready to root for Miko, she’s super interesting but I don’t trust manga to let the childhood friend with twintails win.