Meia

Meia is the girl living on Port Natalia who sends Luka in order to get a pledge of marriage from Kraken so that Meia and her older-than-appearance lover can get married.

If Luka succeeds on his journey, Meia gives Luka a blowjob and Meia's entry is added into the Monster Encyclopedia.

Trivia:

 * Meia is one of three characters in the game to canonically has sexual interactions with Luka. The other two are Sara and Alice.  This also makes Meia the only character who is a monster to canonically have sexual interactions with Luka other than Alice.