I'm not sure what to expect with toyosu's route considering it will probably be shorter than a lot of the other characters, but there are a few implications about his character from the inugami curse that I'm pretty interested in. all of the daiba family's names come from the inugami curse novel (shizuma's father sahei is named after sahei inugami, the family patriarch, his brother is named after sukekiyo inugami, one of sahei's grandsons, and shizuma himself is named after shizuma inugami, another grandson). in the novel, sahei inugami had a very close relationship with a monk named daini after this monk had taken him in and raised him as a child, and the two became so close that their relationship was rumored to be homosexual in nature by those in their neighboring village. their relationship was so intimate even that daini's wife ended up leaving him for a period of time. they continued to be entangled for the rest of daini's life, and the monk continued to have great significance on the dealings of the inugami clan.
all this is to say I wouldn't be surprised if toyosu is modeled after this monk, daini. and this is very interesting to me because it implies that he might have close relations to ooe's inugami clan, the daibas. he's already been depicted in a piece of artwork with a motif usually associated with shizuma, the peacock, so I wonder if that will go anywhere... additionally, in the demo toyosu seemed particularly fond of hinode and watched over him when things became tense, and I remember in his seiyuu announcement teaser he was also standing next to hinode in a way that suggested he was still watching over him. I'd like if they continue to be intertwined... because it's cute of course, but I might see hinode becoming a sort of achilles heel for him. just speculating!