I think I said this here before and I'll say it again...
Give Nyotengu an actual name...
Seriously, it isn't hard in the slightest if she's supposed to be related to Bankotsubo in anyway(which doesn't make sense since she refers to herself(and so does the profile) as a Tengu Princess and while Tengu are no strangers to being liars in their myths, they are also arrogant to a fault so...).
Gohyakumine Bankotsubo
Kuramasan Maouson
Those are the only named Tengu in DOA. Bankotsubo being obvious, Maouson is the Tengu Chief he killed fleeing to the human world for to begin with.
Right then and there, they already have 2 last names for which direction they want to take her as(either way, they seem proven to not make her an outright villain so that's out).
She can either be related to Bankotsubo which means her last name is Gohyakumine or that she's is the daughter of Maouson which means her last name is Kuramasan.
There you go, a last name for her already, it's honestly getting tiresome calling her Lady Tengu to be honest, Hayashi and the team know the West isn't a fan of her just being called that but why the holdup still?
(And my Japanese naming convention is a bit rusty as I'm not certain if they already flipped the names for the English format or it's still the typical Japanese format for them, so if I messed up just let me know without any nonsense okay?)