Sorry for the delay!
Thanks a lot for the feedback. Introducing an example of play would mean a big update, but it's a cool idea. I will keep it in mind.
About a character being dropped by a kotengu:
The characters are human beings with no superpowers, so any fall from a height of 10-15 meters or above should be fatal. Lower than that: 1d6 damage for each 5 meters. I would allow the player a saving roll to see if their character can grab the kotengu and avoid falling.