That’s true… Hmmm.
What follows is unpleasant, fair warning:
I don’t think they’d “waste” them as an investigator. If they ever became an investigator, it might be because the Washuus want them dead.
I feel like no matter what happened, the half-ghoul would be subject to very strict regulations. The Washuus might fear their raw power, and do their best to contain it. Brainwashing and perhaps through force.
The half-ghoul may or may not be used for scientific experiments. It’s possible that regardless of gender, the Washuus would be interested in what kind of offspring they could produce.
I do not think the half-ghoul’s mother would have a very nice life. She would probably be a ‘favorite’ like Furumama. At best. 😦
The half-humans might be unfavorably compared to their half-ghoul sibling.
I personally would hope they’d escape with the help of several Sunlit Garden friends and wreck the Washuus in the end