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There are a couple of places where the hellhound girl's name is displayed as "Hell" and not the player-chosen name. This includes the girl selection screen and the "Hell's room" quest option with Tailè. Are these bugs? (0.64.)

Well with regarding to Taile, all she knows is that the new room was for Hell, so I think its okay to use it that way there, since she don't know her given name.
And for the girl selection screen , people are funny, some times gives long name to their charcters, the name given by me for hell has like 15 characters excluding spaces. so clearly something like that would break the UI.