A translation of a concept art page from Hyrule Historia. Images taken from History of Hyrule’s The Legend of Zelda art anthology.
Imp Poe
Once you defeat an Imp Poe, you can obtain a Poe Soul. Though you can catch them in the game, you don’t have many chances to take a close look at them, since you’re in a hurry.
Aeralfos
Translator’s Note: Oddly, this section is titled Rizarunaagu (Lizalnarg), while Zelda Wiki states that the Japanese name for Aeralfos is Gaanairu (Garnyle). After some poking around, it seems that Japanese players use both names to refer to Aeralfos. Could it be that this enemy is named differently in different versions of Twilight Princess?