What would you like to see in a good one, my friend? Doesn't have to be very specific, platonic or sexual stuff, emotional triggers etc
Well if you cannot be deterred...
The number one problem people have with TOBsunes is that they are all up themselves and comprised from their author's distorted vision of feudal Japan and his personal favourite fap material (not a joke, it is what he has based most of the Kitsune den on).
Seeing as you are not TOBS, you have that covered, but the next problem with the TOBsunes is that they have no bearing on and do not fit the rest of the game. They live in their treehouse bubble, and have nothing to say on the demon invasion which is supposed to be the driving plot of the game. Hells, if you don't take the optional quest from Lady Evergreen, you never get to enter the den and interact with them and the plot doesn't care.
So, on a non-sex partner level, maybe a character who is actually extroverted and interested in the plot. An outcast from the "Cherry blossom throne" who has turned their eye to the world beyond NOT JAPAN, and would like a guide to help them understand.
An earnest, perhaps naive, but well-meaning character that a player could form a relationship over two or three encounters. Maybe you tell him stories of your exploits and he presses for details, which leads to you sharing racy material. One thing leads to another and sex comes after that natural build up.
You could make a boyfriend character who has a genuine interest and complete misunderstanding in your adventures, leading to unique sex scenes when you regale him with stories of specific events (Orc camp, meeting the dryads, saving the centaurs all seem good fits).
In short, if you've seen a harem anime with an oblivious kind hearted protagonist, that for male PC who wishes to sub and female PC who wishes to be the experienced partner (no TOBS style babybag scenes please, I am so sick of bottom female champs being denigrated constantly),