I was looking up some Seaport Hime images when I came over this one:

https://yande.re/post/show/319140

I've paid enough attention to the franchise that I recognize this woman, and she's Seaport Water Oni, not Seaport Hime. They are very similar at first glance, but there are still a few differences in their designs -- for instance, the neck piece of her dress looks like a cross between Seaport Hime's lower neck part and Midway Hime's jagged collar top.

I edited away the Seaport Hime tag and added a Seaport Water Oni tag instead, though this is not a character type yet. Could someone please fix this?

You can create a chara tag by using char:seaport_blabla

That's good to know. I'll keep that in mind for the future.