The "Pirate Attack on the High Seas", "Mountain Bandit Campaign" and "Raid On The Rogue Fortress" levels are Musou Mode exclusive stages, for select characters. However, there is dialogue that had been recorded for other characters for these stages, with the construction of the intros and enemy encounters intact, albeit with some quirks (i.e. force name not showing up, winning the battle under Dong Zhuo/Liu Zhang's banner, incorrect troop colors, etc).

Normally, these stages are accessible as certain characters, but it is possible to hack the game to play as specific characters Musou Mode with these stages, changing the player character identifier, and the game will correctly recognize who is selected.
Contributed by DrakeVagabond
There are cut enemy encounter cutscenes for both Nu Wa and Fu Xi, who do not appear as enemies in any missions. There is dialogue for the encounters and death sequences in the game's files. However, both feature a generic male and female officer T posing in place.
Contributed by DrakeVagabond
Zhu Rong, Meng Huo's wife, is based on the fictional character from the Romance of the Three Kingdoms novel. In the novel she is described as the daughter of the God of Fire of the same name, and the only female character to have actually fought in battles. In the games she only claims to be a descendant of the Fire God.
Contributed by DrakeVagabond